Slow dynamics observed on highly shifted spectral component of $${^{23 } }$$Na NMR in low silica X zeolite loaded with potassium for saturating level
Mutsuo Igarashi; Tadashi Shimizu; Atsushi Goto; Kenjiro Hashi; Keiko Yamamichi; Takehito Nakano, ラスト(シニア)オーサー, Springer Science and Business Media LLC
Interactions, 2024年08月06日, ［査読有り］

Muon Knight shift study on the insulating and metallic states in Na-loaded zeolite low-silica X
M. Hiraishi; K. Utsuno; M. Ishihara; K. Ohishi; K. M. Kojima; T. Nakano, ラスト(シニア)オーサー
Interactions, 2024年06月06日, ［査読有り］

Hyperfine couplings between the paramagnetic moment and nuclei in the metallic phase of low silica X zeolite loaded with potassium
Mutsuo Igarashi; Tadashi Shimizu; Atsushi Goto; Kenjiro Hashi; Keiko Yamamichi; Takehito Nakano, ラスト(シニア)オーサー, Hyperfine coupling constants with the paramagnetic moment have been estimated for ²³Na and ²⁷Al in the metallic phase of the Na-K form of the low silica X (LSX) zeolite loaded with a saturating amount of potassium, 9.0 atoms per supercage., Royal Society of Chemistry (RSC)
Dalton Transactions, 2024年05月28日, ［査読有り］

Antiferromagnetism and insulator-metal transition of alkali metal-loaded sodalite
Takehito Nakano; Kunihiro Watanabe; Atsufumi Hanazawa; Yuko Ishida; Kenji Tanibe; Ryosuke Sakon, 筆頭著者, Magnetic phase diagram of alkali metal-loaded sodalite. The antiferromagnetic transition temperature T_N changes systematically with the alkali species of the clusters formed in the cages., Royal Society of Chemistry (RSC)
Dalton Transactions, 2024年04月11日, ［査読有り］

Magnetic properties of Ca-containing zeolite low-silica X loaded with K atoms
Takehito Nakano; Shuhei Harashima, 筆頭著者, Springer Science and Business Media LLC
Interactions, 2024年04月04日, ［査読有り］

μ+SR Study on ferromagnetism of Na-K alloy clusters in zeolite low-silica X
Luu Manh Kien; Isao Watanabe; and Takehito Nakano, ラスト(シニア)オーサー, Springer Nature
Interactions, 2024年02月27日, ［査読有り］

Antiferromagnetic structure with strongly reduced ordered moment of p-electron in CsO2
T. Nakano; S. Kontani; M. Hiraishi; K Mita; M. Miyajima; and T. Kambe, 筆頭著者
Journal of Physics: Condensed Matter, 2023年08月02日, ［査読有り］

Negative muon spin rotation and relaxation on Li metal
J. Sugiyama; I. Umegaki; S. Takeshita; T. Nakano; K. Ninomiya; K. Shimomura; and M. K. Kubo
Journal of Physics: Conference Series, 2023年03月31日, ［査読有り］

Negative muon spin rotation and relaxation study on battery anode material, spinel Li4Ti5O12
I. Umegaki; K. Ohishi; T. Nakano; S. Nishimura; S. Takeshita; A. Koda; K. Ninomiya; K. Kubo; and J. Sugiyama, American Chemical Society
Journal of Physical Chemistry C, 2022年06月17日, ［査読有り］

Distorted superconducting nodal line on a single Fermi surface in the anisotropic organic superconductor lambda-(BETS)2GaCl4
Dita Puspita Sari; Retno Asih; Ko-ichi Hiraki; Takehito Nakano; Yasuo Nozue; Yasuyuki Ishii; Adrian D. Hillier; and Isao Watanabe, American Physical Society
Physical Review B, 2021年12月17日, ［査読有り］

Spin-gap formation due to spin-Peierls instability in π-orbital-ordered NaO2
M. Miyajima; F. Astuti; T. Fukuda; M. Kodani; S. Iida; S. Asai; A. Matsuo; T. Masuda; K. Kindo; T. Hasegawa; T. C. Kobayashi; T. Nakano; I. Watanabe; and T. Kambe, We have investigated the low-temperature magnetism of sodium superoxide (NaO2), in which spin, orbital, and lattice degrees of freedom are closely entangled. The magnetic susceptibility shows anomalies at T-1 = 220 K and T-2 = 190 K, which correspond well to the structural phase transition temperatures, and a sudden decrease below T-3 = 34 K. At 4.2 K, the magnetization shows a clear stepwise anomaly around 30 T with a large hysteresis. In addition, the muon spin relaxation experiments indicate no magnetic phase transition down to T = 0.3 K. The inelastic neutron scattering spectrum exhibits magnetic excitation with a finite energy gap. These results confirm that the ground state of NaO2 is a spin-singlet state. To understand this ground state in NaO2, we performed Raman scattering experiments. All the Raman-active libration modes expected for the marcasite phase below T-2 are observed. Furthermore, we find that several new peaks appear below T-3. This directly evidences the low crystal symmetry, namely, the presence of the phase transition at T-3. We conclude that the singlet ground state of NaO2 is due to the spin-Peierls instability., American Physical Society
Physical Review B, 2021年10月07日, ［査読有り］

量子ビームの相補利用で見る配列アルカリ金属ナノクラスターの磁気秩序　　　　　　　　　　　　　　　
中野岳仁, 筆頭著者, 日本化学会コロイドおよび界面化学部会
Colloid & Interface Communication, 2021年08月10日, ［招待有り］

Antiferromagnetic orderings of alkali-metal nanoclusters arrayed in sodalite crystal studied by μSR and other microscopic probes
Takehito Nakano, 筆頭著者
Journal of Computer Chemistry, Japan, 2021年02月28日, ［査読有り］, ［招待有り］

Electric dipole induced bulk ferromagnetism in dimer Mott molecular compounds
R. Yoshimoto; S. Yamashita; H. Akutsu; Y. Nakazawa; T. Kusamoto; Y. Oshima; T. Nakano; H. M. Yamamoto; R. Kato, Magnetic properties of Mott–Hubbard systems are generally dominated by strong antiferromagnetic interactions produced by the Coulomb repulsion of electrons. Although theoretical possibility of a ferromagnetic ground state has been suggested by Nagaoka and Penn as single-hole doping in a Mott insulator, experimental realization has not been reported more than half century. We report the first experimental possibility of such ferromagnetism in a molecular Mott insulator with an extremely light and homogeneous hole-doping in π-electron layers induced by net polarization of counterions. A series of Ni(dmit)₂ anion radical salts with organic cations, where dmit is 1,3-dithiole-2-thione-4,5-dithiolate can form bi-layer structure with polarized cation layers. Heat capacity, magnetization, and ESR measurements substantiated the formation of a bulk ferromagnetic state around 1.0 K with quite soft magnetization versus magnetic field (M–H) characteristics in (Et-4BrT)[Ni(dmit)₂]₂ where Et-4BrT is ethyl-4-bromothiazolium. The variation of the magnitude of net polarizations by using the difference of counter cations revealed the systematic change of the ground state from antiferromagnetic one to ferromagnetic one. We also report emergence of metallic states through further doping and applying external pressures for this doping induced ferromagnetic state. The realization of ferromagnetic state in Nagaoka–Penn mechanism can paves a way for designing new molecules-based ferromagnets in future., Springer Science and Business Media LLC
Scientific Reports, 2021年01月14日, ［査読有り］

Nuclear magnetic field in Na0.7CoO2 detected with μ–SR
J. Sugiyama; I. Umegaki; S. Takeshita; H. Sakurai; S. Nishimura; O. K. Forslund; E. Nocerino; N. Matsubara; M. Mansson; T. Nakano; I. Yamauchi; K. Ninomiya; K. Kubo; K. Shimomura, American Physical Society
Physical Review B, 2020年10月22日, ［査読有り］

Anisotropy of lower critical field in organic layered superconductor λ-(BETS)2GaCl4
D. P. Sari; N. Rui; K. Hiraki; T. Nakano; M. Hagiwara; Y. Nozue; T. Kusakawa; A. Hori; I. Watanabe; Y. Ishii, © 2020 Trans Tech Publications Ltd, Switzerland. The lower critical field of type-II organic layered superconductor λ-(BETS)2GaCl4 has been estimated by magnetic measurements. The demagnetization factor of a needle-like sample shape has been taken into account for the measurements by applying external field, parallel and perpendicular to the conducting plane. The lower critical field for the field parallel to the conducting plane is 5.2(4) G, in contrast with the previous studies. This allows us to discuss the anisotropy of lower critical field Hc1 in a quasi-two-dimensional organic layered superconductor λ-(BETS)2GaCl4., Trans Tech Publications Ltd, Switzerland
Key Engineering Materials, 2020年08月25日, ［査読有り］

Metallic state in rubidium-loaded low-silica X zeolite
Peter Jeglič; Takehito Nakano; Tadej Mežnaršič; Denis Arčon; Mutsuo Igarashi
Journal of the Physical Society of Japan, 2020年06月18日, ［査読有り］

Anomalous spiked structures in ESR signals from the chiral helimagnet CrNb3S6
D. Yoshizawa; Y. Sawada; Y. Kousaka; J. Kishine; Y. Togawa; M. Mito; K. Inoue; J. Akimitsu; T. Nakano; Y. Nozue; M. Hagiwara, We have performed X-band electron spin resonance (ESR) measurements on a single crystal of the metallic chiral helimagnet CrNb3S6 from 3.5 to 180 K and for the external magnetic fields H-ext, up to 4 kOe, perpendicular to the c axis (the helical axis of CrNb3S6). This field-crystalline configuration is expected to provide the chiral soliton lattice (CSL) state in this system. The main resonance line can be fit with a Dysonian function above T-c = 127 K, but additional features in the spectra were observed below 105 K. Specifically, spiked anomalies superposed on the main signals were observed for magnetic fields between H-c1 and H-c2 that are the appearing and disappearing fields of the spiked anomalies, respectively. The resulting magnetic field vs temperature phase diagram possesses three regions, which are interpreted as different dynamical responses in the CSL phase. In addition, the values of H-c2 are close to those reported by the d(2)M/dH(2) curve [Tsuruta et al., Phys. Rev. B 93, 104402 (2016)]. Furthermore, the field range between H-c1 and H-c2, where the spiked anomalies exist, depends on the field direction and shifts to higher fields when turning to the c axis, thereby providing additional evidence that these spiked anomalies must be related to the chiral soliton dynamics., AMER PHYSICAL SOC
Physical Review B, 2019年09月09日, ［査読有り］

Synthesis and characterization of magnetic rubidium superoxide, RbO2
F. Astuti; M. Miyajima; T. Fukuda; M. Kodani; T. Nakano; T. Kambe; I. Watanabe
Materials Science Forum, 2019年08月06日, ［査読有り］

Magnetic study of the lower critical field of organic superconductor lambda-(BETS)2GaCl4
D. P. Sari; K. Hiraki; T. Nakano; M. Hagiwara; Y. Nozue; T. Kusakawa; A. Hori; A. Yamamoto; I. Watanabe; Y. Ishii, © 2019 Trans Tech Publications Ltd, Switzerland. The lower critical field of type-II organic layered superconductor λ-(BETS)2GaCl4 has been estimated by magnetic measurements. In this study, the demagnetization factor of a needle-like sample shape has been taken into account for the measurements by applying external field, parallel and perpendicular to the conducting plane. The lower critical field Hc1 for the field perpendicular to the conducting plane is 8(1) G, convincing the previous study. This estimation allows us to predict the ideal external field that should be applied for London penetration depth measurements by using muon-spin rotation (µSR) spectroscopy.
Materials Science Forum, 2019年08月06日, ［査読有り］

Anionogenic magnetism combined with lattice symmetry in alkali-metal superoxide RbO2
F. Astuti; M. Miyajima; T. Fukuda; M. Kodani; T. Nakano; T. Kambe; I. Watanabe, X-ray powder diffraction (XRPD), magnetic susceptibility and muon-spin relaxation (mu SR) measurements were carried out to investigate lattice symmetries and magnetic properties of one of alkali-metal superoxides, RbO2. Two structural transitions were observed around 170 and 100K in conjunction with the appearance of anomalies in the magnetic susceptibility. A static antiferromagnetic long-range ordered state of unpaired spins on O-2(-) dumbbells with the full magnetic volume fraction was confirmed from mu SR below about 15 K. In comparison with CsO2, it is suggested that small changes in the lattice symmetry driven by changes in the O-2(-) dumbbell orientation causes different magnetic properties in alkali-metal superoxides., The Physical Society of Japan
Journal of the Physical Society of Japan, 2019年03月07日, ［査読有り］

Ferromagnetism of potassium metal under pressure loading into low-silica X zeolite
S. Araki; N. H. Nam; K. Shimodo; T. Nakano; Y. Nozue, American Physical Society
Physical Review B, 2019年03月04日, ［査読有り］

High-field Magnetism of the Honeycomb-lattice Antiferromagnet Cu2(pymca)3(ClO4)
A. Okutani; T. Kida; Y. Narumi; T. Shimokawa; Z. Honda; K. Kindo; T. Nakano; Y. Nozue; M. Hagiwara, ©2019 The Physical Society of Japan. We report on the experimental results of magnetic susceptibility, specific heat, electron spin resonance (ESR), and high-field magnetization measurements performed on a polycrystalline sample of the spin-1=2 distorted honeycomb-lattice antiferromagnet Cu2(pymca)3(ClO4). The magnetic susceptibility shows a broad peak near 25 K, typical of a low-dimensional antiferromagnet, and no long-range magnetic order is observed down to 0.6 K in the specific heat measurements. The magnetization curve up to 70 T at 1.4 K shows three step-like features. Assuming three different exchange bonds JA, JB, and JC based on the structure, the calculated magnetization curve reproduces the observed one when JA=kB = 43.7 K, JB=JA = 1, and JC=JA = 0.2, except for the magnetization near 70 T, where the observed magnetization indicates another step while the calculated magnetization becomes saturated. The relationship between the magnetization plateaus and exchange bonds is discussed based on the numerical calculations.
Journal of the Physical Society of Japan, 2018年12月04日, ［査読有り］

Magnetism and High-magnetic Field Magnetization in Alkali Superoxide CsO₂
Miyajima Mizuki; Astuti Fahmi; Kakuto Takeshi; Matsuo Akira; Sari Dita Puspita; Asih Retno; Okunishi Kouichi; Nakano Takehito; Nozue Yasuo; Kindo Koichi; Watanabe Isao; Kambe Takashi, Alkali superoxide CsO2 is one of the candidates for the spin-1 2 one-dimensional (1D) antiferromagnet, which may be sequentially formed by an ordering of the π-orbital of O2 molecule below TS ∼ 70 K. Here, we report the magnetism and the high-magnetic field magnetization in pulsed-magnetic fields up to 60 T in powder CsO2. We obtained the low temperature phase diagram around the antiferromagnetic ordering temperature TN = 9.6 K under the magnetic field. At T = 1.3 K, we observed a remarkable up-turn curvature in the magnetization around a saturation field of ∼60 T, which indicates the low-dimensional nature of the spin system. The saturated magnetization is also estimated to be ∼1μB, which corresponds to spin-1 2. In this study we compare it with the theoretical calculation., Physical Society of Japan
Journal of the Physical Society of Japan, 2018年06月, ［査読有り］

Magnetodielectric properties of the square cupola antiferromagnet Ba(TiO)Cu4(PO4)4
Kenta Kimura; Masakazu Sera; Takehito Nakano; Yasuo Nozue; Tsuyoshi Kimura, Magnetodielectric properties of the tetragonal magnetic insulator Ba(TiO)Cu4(PO4)4 consisting of asymmetric Cu4O12 square cupolas have been investigated in a magnetic field along the [001] axis (B[001]), where a metamagnetic transition occurs at Bc||[001] ~ 12 T and 1.4 K. Clear anomalies associated with the transition to the high-field phase are observed in dielectric constants both along the [100] (ε[100]) and [001] (ε[001]) axes. It is found that the B dependence of ε[001] and ε[100] across Bc||[001] is anisotropic: ε[001] decreases while ε[100] increases. The origin of this anisotropic magnetodielectric response is discussed., Elsevier B.V.
Physica B: Condensed Matter, 2018年05月01日, ［査読有り］

μSR study on hydrogen behavior in palladium
M. Mihara; H. Araki; M. Mizuno; K. Shimomura; W. Higemoto; K. Sugita; K. Atsushi; M. Kondo; Y. Tanaka; T. Matsuzaki; R. Kadono; W. Sato; T. Nakano; T. Fukuda, Journal of the Physical Society of Japan
JPS Conference Proceedings, 2018年03月01日, ［査読有り］

Small bipolarons and extended states of guest Na and Rb atoms in quasi-two-dimensional disordered M7.8−δAl7.8Si8.2O32.0 (M=Na, Rb)
Gayan Prasad Hettiarachchi; Fumiya Moriasa; Yoshihumi Nishida; Takehito Nakano; Mohd Nazlan Mohd Muhid; Halimaton Hamdan
Physical Review B, 2017年10月12日, ［査読有り］

Thermally Activated Motion of Sodium Cations in Insulating Parent Low-Silica X Zeolite
Igarashi Mutsuo; Jeglič Peter; Mežnaršič Tadej; Nakano Takehito; Nozue Yasuo; Watanabe Naohiro; Arčon Denis, The Physical Society of Japan
Journal of the Physical Society of Japan, 2017年06月30日, ［査読有り］

Electrons of alkali metals in regular nanospaces of zeolites
T. Nakano; Y. Nozue, 筆頭著者
Advances in Physics: X, 2017年02月06日, ［査読有り］

Magnetic Moments and Ordered States in Pyrochlore Iridates Nd₂Ir₂O₇ and Sm₂Ir₂O₇ Studied by Muon-Spin Relaxation
Asih Retno; Adam Noraina; Mohd-Tajudin Saidah Sakinah; Sari Dita Puspita; Matsuhira Kazuyuki; Guo Hanjie; Wakeshima Makoto; Hinatsu Yukio; Nakano Takehito; Nozue Yasuo; Sulaiman Shukri; Mohamed-Ibrahim Mohamad Ismail; Biswas Pabitra Kumar; Watanabe Isao, Magnetic-ordered states of the pyrochlore iridates Nd2Ir2O7 (Nd227) and Sm2Ir2O7 (Sm227), showing metal–insulator transitions at 33 and 117 K, respectively, were studied by both the muon-spin-relaxation (μSR) method and density functional theory (DFT) calculations. A long-range magnetic ordering of Ir moments appeared in conjunction with the metal insulator transition, and additional long-range-ordered states of Nd/Sm moments were confirmed at temperatures below about 10 K. We found that the all-in all-out spin structure most convincingly explained the present μSR results of both Nd227 and Sm227. Observed internal fields were compared with values derived from DFT calculations. The lower limits of the sizes of magnetic moments were estimated to be 0.12 μB and 0.2 μB for Ir and Nd moments in Nd227, and 0.3 μB and 0.1 μB for Ir and Sm moments in Sm227, respectively. Further analysis indicated that the spin coupling between Ir and Nd/Sm moments was ferromagnetic for Nd227 and antiferromagnetic for Sm227., 一般社団法人日本物理学会
Journal of the Physical Society of Japan, 2017年02月, ［査読有り］

Electronic Properties of Alkali Metals Loaded into Channel-Type Zeolite L
P. T. Thi; T. Nakano; Y. Sakamoto; Y. Nozue, Rb metal was loaded into dehydrated Rb-form zeolite L. The loading density of Rb atoms per unit cell, n, was changed up to 7.1. A resonant optical absorption-reflection band is observed at approximate to 1.0 eV in all samples. A new reflection band appears at approximate to 1.7 eV for n > 5. The 1.0 and 1.7 eV bands are assigned to the respective excitations from 1s to 1p and from 1p to 1d quantum states of s-electrons one-dimensionally confined in main-channels with an inside diameter of approximate to 1 nm. A temperature-dependent semiconducting resistivity is observed at n > 2, and is assigned to the inter-channel polaron hopping between metallic 1s and 1p states. Besides, a nearly metallic resistivity with the low thermal activation energy is observed at n > 5. The metallic conductivity is assigned to three-dimensional s-electrons in the 1d state. The metallic property in Rb-loaded zeolite L is more remarkable than those in K-loaded zeolite L. The difference is explained by the smaller ionization energy of Rb atom, which leads to a shallower one-dimensional confinement potential of main-channel and a smaller polaron effect., IOP PUBLISHING LTD
3RD INTERNATIONAL CONFERENCE ON FUNCTIONAL MATERIALS SCIENCE 2016, 2017年, ［査読有り］

μSR study of organic superconductor λ-(BETS)2GaCl4
D. P. Sari; R. Asih; S. S. Mohm-Tajudin; N. Adam; K. Hiraki; Y. Ishii; T. Takahashi; T. Nakano; Y. Nozue; S. Sulaiman; M. I. Mohamed-Ibrahim; I. Watanabe, Muon-spin-relaxation (mu SR) measurements in the transverse-field (TF) of 30 G were carried out from 7 K down to 1.8 K on the non-magnetic anion-based organic superconductor lambda-(BETS)(2)GaCl4. The TF-mu SR time spectrum showed a significant increase with the Gaussian-type damping behavior below the superconducting transition temperature T-C = 5 K confirming the bulk SC state with the full volume fraction. The zero-field (ZF) mu SR time spectrum did not show any change against the temperature down to 1.7 K, suggesting that the time reversal symmetry of the Cooper pair might not be broken., IOP PUBLISHING LTD
IOP Conf. Ser.: Mater. Sci. Eng., 2017年, ［査読有り］

放射光・中性子・ミュオンで見た配列アルカリ金属ナノクラスターの磁気秩序　　　　　　　　　　　　　　　
中野岳仁, 筆頭著者
SPring-8/SACLA Information, 2016年11月01日, ［査読有り］

Magnetodielectric detection of magnetic quadrupole order in Ba(TiO)Cu-4(PO4)(4) with Cu4O12 square cupolas
K. Kimura; P. Babkevich; M. Sera; M. Toyoda; K. Yamauchi; G. S. Tucker; J. Martius; T. Fennell; P. Manuel; D. D. Khalyavin; R. D. Johnson; T. Nakano; Y. Nozue; H. M. Ronnow; T. Kimura, In vortex-like spin arrangements, multiple spins can combine into emergent multipole moments. Such multipole moments have broken space-inversion and time-reversal symmetries, and can therefore exhibit linear magnetoelectric (ME) activity. Three types of such multipole moments are known: toroidal; monopole; and quadrupole moments. So far, however, the ME activity of these multipole moments has only been established experimentally for the toroidal moment. Here we propose a magnetic square cupola cluster, in which four corner-sharing square-coordinated metal-ligand fragments form a noncoplanar buckled structure, as a promising structural unit that carries an ME-active multipole moment. We substantiate this idea by observing clear magnetodielectric signals associated with an antiferroic ME-active magnetic quadrupole order in the real material Ba(TiO)Cu-4(PO4)(4). The present result serves as a useful guide for exploring and designing new ME-active materials based on vortex-like spin arrangements., NATURE PUBLISHING GROUP
NATURE COMMUNICATIONS, 2016年10月, ［査読有り］

Two different ground states in K-intercalated polyacenes
Quynh T. N. Phan; Satoshi Heguri; Hiroyuki Tamura; Takehito Nakano; Yasuo Nozue; Katsumi Tanigaki, The electronic states of potassium- (K-) intercalated zigzag-type polycyclic aromatic (PLA) hydrocarbon [polyacene PLAs] K-x (PLAs) are studied for a series of the four smallest molecules: naphthalene (NN), anthracene (AN), tetracene (TN), and pentacene (PN), focusing on their 1:1 stoichiometric phases. Clear experimental differences are identified between the first group [K-1(NN) and K-1(AN)] and the second group [K1(TN) and K-1(PN)] by magnetic, vibrational, and optical measurements. The first group is categorized as a Mott insulator with an antiferromagnetic ground state with energy of similar to 10 meV, whereas the second group is classified as a band insulator via dimer formation due to the spin Peierls instability. In the latter system, the first thermally accessible triplet states are located far apart from the singlet ground states and are not detected by electron spin-resonance spectroscopy until 300 K being very different from what is observed for the hole-doped PN reported earlier. The results give a new systematic understanding on the electronic states of electron-doped PLAs sensitive to the energetic balance among on-site Coulomb repulsion, bandwidth, and the Peierls instability., AMER PHYSICAL SOC
PHYSICAL REVIEW B, 2016年02月, ［査読有り］

Optical, Electrical and Magnetic Properties of Potassium Metal Loaded into Channel-Type Zeolite L
Thi Pham Tan; Nakano Takehito; Sakamoto Yasuhiro, Potassium metal was loaded into K-form zeolite L crystals which have one-dimensional (1D) main-channels with an inside diameter of ≈1 nm. The loading density of K atoms per unit cell, n, was changed from 0 to 9.6. Optical, electrical and magnetic properties were measured for the powders of K-loaded zeolite L crystals. A resonant optical absorption reflection band is observed at ≈1.1eV in all K-loaded samples. Another reflection band at ≈1.8eV appears at n 5. The 1.1 and 1.8 eV bands are assigned to the respective excitations from 1s to 1p and from 1p to 1d states of s-electrons confined in main-channels. A mid-infrared absorption around 0.3 eV is observed at n 3 and increases with n. This absorption is assigned to a Drude term of s-electrons. A temperature-dependent semiconducting resistivity is observed at 3 n 9. A nearly metallic resistivity is observed at 9 n. The semiconducting and metallic resistivities are assigned to the polaron hopping between main-channels and the three-dimensional (3D) band conduction, respectively. A temperature independent spin-susceptibility is extracted from the integrated intensity of ESR signal, and increases at n 5. This term is assigned to the Pauli paramagnetism. These properties are interpreted in terms of an insulating state of 1s and 1p states at n 5, a 1D metallic state of 1s and 1p states at 5 n 9 and a 3D metallic state of 1d state at 9 n for s-electrons in the bundle of main-channels., Physical Society of Japan
Journal of the Physical Society of Japan, 2016年02月, ［査読有り］

Metal-to-insulator crossover in alkali doped zeolite
Mutsuo Igarashi; Peter Jeglic; Andraz Krajnc; Rok Zitko; Takehito Nakano; Yasuo Nozue; Denis Arcon, We report a systematic nuclear magnetic resonance investigation of the Na-23 spin-lattice relaxation rate, 1/T-1, in sodium loaded low-silica X (LSX) zeolite, Na-n/Na-12-LSX, for various loading levels of sodium atoms n across the metal-to-insulator crossover. For high loading levels of n >= 14.2, 1/T1T shows nearly temperature-independent behaviour between 10 K and 25 K consistent with the Korringa relaxation mechanism and the metallic ground state. As the loading levels decrease below n <= 11.6, the extracted density of states (DOS) at the Fermi level sharply decreases, although a residual DOS at Fermi level is still observed even in the samples that lack the metallic Drude-peak in the optical reflectance. The observed crossover is a result of a complex loading-level dependence of electric potential felt by the electrons confined to zeolite cages, where the electronic correlations and disorder both play an important role., NATURE PUBLISHING GROUP
SCIENTIFIC REPORTS, 2016年01月

Ionothermal synthesis and magnetic study of a new manganese(II) phosphite with an unprecedented Mn/P ratio
Tan Su; Hongzhu Xing; Yi Li; Junbiao Wu; Xiaowei Song; Takehito Nakano; Jihong Yu, A new layered manganese(II) phosphite, vertical bar NH4 vertical bar(4)[Mn-4(PO3H)(6)] (JIS-10), has been synthesised via the ionothermal method by using 1-pentyl-3-methylimidazolium bromide ([Pmim]Br) as the solvent. JIS-10 is the first manganese phosphite with a Mn/P ratio of 2/3, whose layered framework is built by the alternate connection of Mn2O9 dimers and PO3H pseudo-tetrahedra. JIS-10 represents an antiferromagnetic dimer system with S = 5/2 for each Mn2+ ion., CHINESE CHEMICAL SOC
INORGANIC CHEMISTRY FRONTIERS, 2016年, ［査読有り］

Observation of the orbital quantum dynamics in the spin-1/2 hexagonal antiferromagnet Ba3CuSb2O9
Yibo Han; Masayuki Hagiwara; Takehito Nakano; Yasuo Nozue; Kenta Kimura; Mario Halim; Satoru Nakatsuji, We have studied orbital dynamics in the spin liquid candidate Ba3CuSb2O9 using multifrequency electron-spin resonance. We prepared two high-quality single crystals. The crystal with a slight copper deficiency shows a structural phase transition at around 200 K due to the cooperative Jahn-Teller effect, accompanied with orbital ordering. In contrast, the crystal with almost perfect stoichiometry shows no orbital ordering down to the lowest temperature of 1.5 K. Dramatic change in the g factor anisotropy as a function of frequency and temperature demonstrates orbital quantum fluctuations at a nearly constant time scale of similar to 100 ps below 20 K, evidencing the emergence of an orbital liquid state in this quantum spin liquid compound., AMER PHYSICAL SOC
PHYSICAL REVIEW B, 2015年11月, ［査読有り］

Neutron diffraction study of antiferromagnetic potassium nanoclusters incorporated into sodalite
T. Nakano; M. Matsuura; A. Hanazawa; Y. Nozue, 筆頭著者
JPS Conference Proceedings, 2015年09月25日, ［査読有り］

Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal
Naoyuki Katayama; Kenta Kimura; Yibo Han; Joji Nasu; Natalia Drichko; Yoshiki Nakanishi; Mario Halim; Yuki Ishiguro; Ryuta Satake; Eiji Nishibori; Masahito Yoshizawa; Takehito Nakano; Yasuo Nozue; Yusuke Wakabayashi; Sumio Ishihara; Masayuki Hagiwara; Hiroshi Sawa; Satoru Nakatsuji, With decreasing temperature, liquids generally freeze into a solid state, losing entropy in the process. However, exceptions to this trend exist, such as quantum liquids, which may remain unfrozen down to absolute zero owing to strong quantum entanglement effects that stabilize a disordered state with zero entropy. Examples of such liquids include Bose-Einstein condensation of cold atoms, superconductivity, quantum Hall state of electron systems, and quantum spin liquid state in the frustrated magnets. Moreover, recent studies have clarified the possibility of another exotic quantum liquid state based on the spin-orbital entanglement in FeSc2S4. To confirm this exotic ground state, experiments based on single-crystalline samples are essential. However, no such single-crystal study has been reported to date. Here, we report, to our knowledge, the first single-crystal study on the spin-orbital liquid candidate, 6H-Ba3CuSb2O9, and we have confirmed the absence of an orbital frozen state. In strongly correlated electron systems, orbital ordering usually appears at high temperatures in a process accompanied by a lattice deformation, called a static Jahn-Teller distortion. By combining synchrotron X-ray diffraction, electron spin resonance, Raman spectroscopy, and ultrasound measurements, we find that the static Jahn-Teller distortion is absent in the present material, which indicates that orbital ordering is suppressed down to the lowest temperatures measured. We discuss how such an unusual feature is realized with the help of spin degree of freedom, leading to a spin-orbital entangled quantum liquid state., NATL ACAD SCIENCES
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2015年07月, ［査読有り］

Ferromagnetism of Na–K Alloy Clusters Incorporated in Zeolite Low-Silica X
Kien Luu Manh; Goto Teruo; Hanh Duong Thi; Nakano Takehito; Nozue Yasuo, The Physical Society of Japan
Journal of the Physical Society of Japan, 2015年05月29日, ［査読有り］

Synchrotron-radiation-based Mössbauer spectroscopy of ⁴⁰K in antiferromagnetic potassium nanoclusters in sodalite
Takehito Nakano; Naoki Fukuda; Makoto Seto; Yasuhiro Kobayashi; Ryo Masuda; Yoshitaka Yoda; Mototsugu Mihara; Yasuo Nozue, Synchrotron-radiation-based Mössbauer absorption spectroscopy of K40 nuclei was performed. We investigated potassium nanoclusters arrayed in a porous crystal of sodalite. The nanoclusters exhibit antiferromagnetic (AFM) ordering below ≃ 72 K. The energy-domain <
sup>
40<
/sup>
K Mössbauer spectra were successfully obtained in the temperature range of 8-140 K. Precise analysis of the spectra indicates the appearance of a hyperfine magnetic field at low temperatures. The hyperfine field was evaluated to be 9.2 ± 3.0 T at 8 K. This result signifies the spontaneous polarization of s-electron spins in three-dimensionally arrayed potassium nanoclusters in AFM-ordered states., American Physical Society
Physical Review B - Condensed Matter and Materials Physics, 2015年04月06日, ［査読有り］

Synchrotron-radiation-based Mössbauer spectroscopy of 40K in antiferromagnetic potassium nanoclusters in sodalite
T. Nakano; N. Fukuda; M. Seto; Y. Kobayashi; R. Masuda; Y. Yoda; M. Mihara; Y. Nozue, Synchrotron-radiation-based Mossbauer absorption spectroscopy of K-40 nuclei was performed. We investigated potassium nanoclusters arrayed in a porous crystal of sodalite. The nanoclusters exhibit antiferromagnetic (AFM) ordering below similar or equal to 72 K. The energy-domain K-40 Mossbauer spectra were successfully obtained in the temperature range of 8-140 K. Precise analysis of the spectra indicates the appearance of a hyperfine magnetic field at low temperatures. The hyperfine field was evaluated to be 9.2 +/- 3.0 T at 8 K. This result signifies the spontaneous polarization of s-electron spins in three-dimensionally arrayed potassium nanoclusters in AFM-ordered states., AMER PHYSICAL SOC
Physical Review B, 2015年04月, ［査読有り］

Insulator-to-Metal Transition in Potassium-Loaded Zeolite P
Hettiarachchi Gayan Prasad; Nakano Takehito; Masaki Yusuke, Potassium metal was loaded into porous crystals of potassium-form maximum aluminum zeolite P (K-MAP), and optical absorption, electrical resistivity, and magnetic susceptibility measurements were performed. The average loading density of potassium atoms per GIS cage of zeolite P, n, was systematically changed up to 1.09. Optical absorption bands are observed around 1.3-2 eV and grow to dominate the spectrum with increasing n. These absorption bands are assigned to the optical excitations of s-electrons confined in the zigzag channels of GIS cages. The temperature dependence of electrical resistivity rho indicates insulating properties for n less than or similar to 1.05. At n = 1.09, rho suddenly decreases by several orders of magnitude, and shows metallic properties indicating that an insulator-to-metal transition occurs between n = 1.05 and 1.09. The samples are basically nonmagnetic at any n. The nonmagnetic and insulating phase at n less than or similar to 1.05 is explained by the formation of small bipolarons in the spin-singlet states. The metallic phase at n = 1.09 is explained by the formation of large polarons., Physical Society of Japan
Journal of the Physical Society of Japan, 2015年01月, ［査読有り］

Crystal Structures of Heavily Na-Loaded Low-Silica X (LSX) Zeolites in Insulating and Metallic States
Takuji Ikeda; Takehito Nakano; Yasuo Nozue, Crystal structures of sodium clusters incorported in LSX zeolite [Na12Al12Si12O48 (Z = 8)] with FAU-type topology are analyzed by power X-ray diffraction. The two different Na-loaded samples, Na-9.4/Na-12-LSX and Na-16.7/Na-12-LSX show insulating and metallic states, respectively. The insulating state is changed to the metallic state upon increasing the loading density of Na atoms. The two samples have the space group Fd (3) over bar attributed to cubic symmetry and lattice constants of a = 2.49646(3) nm for Na-9.4/Na-12-LSX and a = 2.495060(11) nm for Na-16.7/Na-12-LSX. In both samples, three cation sites at the centers of two types of 6-ring of the sod-cage and the centers of the d6r prism are fully occupied by Nations. In addition, a large number of Na cations forming Na clusters are distributed in the cavity (supercage), and Na distribution inside the cavity is disorderly, which is represented by several independent sites with low site occupancy. Electron-density distribution analysis clearly reveals the covalent bond of Si(Al)-O and disordered Na distribution in the cavity. In addition, electron densities based onthe orbital hybridization betwen a Na cation and framework oxygen atom are observed around the 12-ring. In Na-16.7/Na-12-LSX, the formation of the chain-like Na cation distribution, which connects between the second neighboring cavities, is represented. Howver, this Na-Na connectivity is not formed in Na-9.4/Na-12-LSX is much larger than that in Na-9.4/Na-12-LSX. The cation sites can be classified into two types of character: (a) close to the inner wall of cavity and (b) around the center of cavity and/or at the center of 12-ring pore window. In the domain (b), the number of cations remarkably increases with the increases n. This change must be strongly related to the insulator-to-metal transition., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, 2014年10月, ［査読有り］

Tuning of the ground state in electron doped anthracene
Quynh T. N. Phan; Satoshi Heguri; Yoichi Tanabe; Hidekazu Shimotani; Takehito Nakano; Yasuo Nozue; Katsumi Tanigaki, High quality bulk samples of anthracene (AN) doped with potassium (K) in 1 : 1 and 2 : 1 stoichiometries were successfully prepared by a method involving a room temperature solid-state mechanical diffusion process prior to intercalation reactions during heat treatment, and their physical properties were studied using both magnetic and optical measurements. The transfer of almost one electron from K to AN in K-1(AN) was confirmed by SQUID and ESR measurements. A pronounced magnetic hump centered at 150 K associated with antiferromagnetic interactions was observed, which can most likely be interpreted in terms of on-site Coulomb repulsions of the Mott insulating states. Optical spectra of K-1(AN) clearly showed the insulating states, as well as the electron occupation of the LUMO-derived band of AN. Our results demonstrated tuning of the ground state of a typical bulk hydrocarbon by alkali metal intercalation., ROYAL SOC CHEMISTRY
DALTON TRANSACTIONS, 2014年, ［査読有り］

Antiferromagnetic resonance in alkali-metal clusters in sodalite
Takehito Nakano; Hajime Tsugeno; Atsufumi Hanazawa; Takanari Kashiwagi; Yasuo Nozue; Masayuki Hagiwara, We have performed electron spin resonance (ESR) studies of K-4(3+) and (K3Rb)(3+) nanoclusters incorporated in powder specimens of aluminosilicate sodalite at several microwave frequencies between 9 and 34 GHz. The K-4(3+) and (K3Rb)(3+) clusters are arrayed in a bcc structure and are known to show antiferromagnetic ordering below the Neel temperatures of T-N similar or equal to 72 and similar or equal to 80 K, respectively, due to the exchange coupling between s electrons confined in the clusters. We have found sudden broadenings of ESR spectra in both samples below TN. The line shape of the spectra below T-N is analyzed by powder pattern simulations of antiferromagnetic resonance (AFMR) spectra. The calculated line shapes well reproduce the experimental ones at all the frequencies by assuming a biaxial magnetic anisotropy. We have evaluated extremely small anisotropy fields of approximately 1 Oe indicating that these materials are ideal Heisenberg antiferromagnets. We have also found that the magnetic anisotropy changes from easy- plane type to uniaxial type by changing into a heavier alkali- metal cluster and that the g value shifts to a large value beyond two below T-N for K-4(3+) and (K3Rb)(3+) nanoclusters. These novel features of K-4(3+) and (K3Rb)(3+) nanoclusters incorporated in sodalite are discussed., AMER PHYSICAL SOC
PHYSICAL REVIEW B, 2013年11月, ［査読有り］

Exotic magnetism of s-electron cluster arrays: Ferromagnetism, ferrimagnetism and antiferromagnetism
Takehito Nakano; Duong Thi Hanh; Yasuo Nozue; Nguyen Hoang Nam; Truong Cong Duan; Shingo Araki, Alkali metal nanoclusters can be stabilized in the regular cages of zeolite crystals by the loading of guest alkali metals. Cages are connected by the sharing of windows of the framework, and arrayed in simple cubic, diamond and body centered cubic structures in zeolites A, X and sodalite, respectively. The s-electrons have the localized nature of nanoclusters with magnetic moments, and have mutual interactions through the windows of cages. They show exotic magnetism depending on the structure type of zeolites, the kind of alkali metals and the average loading density of alkali atoms per cage. In zeolite A, potassium clusters are formed in α-cages that have an inside diameter of 11 Å. They exhibit ferromagnetic properties explained by the canted antiferromagnetism of the Mott insulator, where the 1p-like degenerate orbitals of clusters play an essential role in the magnetic properties. Na-K alloy clusters generated at supercages and β-cages of low-silica X (LSX) zeolite exhibit Néel's N-type ferrimagnetism at specific loading densities of alkali metals. Alkali metal clusters in sodalite show the ideal Heisenberg antiferromagnetism of the Mott insulator. © 2013 The Korean Physical Society.
Journal of the Korean Physical Society, 2013年08月, ［査読有り］

Insulator-to-metal transition and magnetism of potassium metals loaded into regular cages of zeolite LSX
Takehito Nakano; Duong Thi Hanh; Akihiro Owaki; Yasuo Nozue; Nguyen Hoang Nam; Shingo Araki, Zeolite LSX (low-silica X) crystals have an aluminosilicate framework with regular supercages and beta-cages. They are arrayed in a double diamond structure. The loading density of guest K atoms per supercage (or beta cage), n, can be controlled from 0 to a parts per thousand 9. At n < 2, samples are nearly nonmagnetic and insulating. The Curie constant has a clear peak at n = 3, and the electrical resistivity suddenly decreases simultaneously. The electrical resistivity suddenly decreases again at n = 6 and shows metallic phase at n > 6. These properties are explained by the polaron effect including the electron correlation. Ferrimagnetic properties are observed at n a parts per thousand 9. A remarkable increase in the resistivity is observed at very low temperatures at n a parts per thousand 9, and is discussed in terms of the hypothesis of a Kondo insulator., KOREAN PHYSICAL SOC
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2013年08月, ［査読有り］

Antiferromagnetic phase transition of K-Rb alloy nanoclusters incorporated in sodalite
Takehito Nakano; Yuko Ishida; Atsufumi Hanazawa; Yasuo Nozue, We prepared Rb-rich K-Rb alloy nanoclusters arrayed in the regular nanospace of aluminosilicate sodalite which has a bcc arrangement of cages. The average chemical formula of the cluster is (K1.5Rb2.5)(3+), where one unpaired s-electron is shared by four alkali cations and is confined in a cage. The magnetic susceptibility and the electron spin resonance clearly show an antiferromagnetic phase transition at a N,el temperature T (N) of approximately 90-100 K. The observed T (N) is higher than that in K (4) (3+) (T (N) = 72 K) and (K3Rb)(3+) clusters (T (N) = 80 K) in sodalites. This result indicates a systematic enhancement of the antiferromagnetic exchange coupling between the adjacent nanoclusters by substituting Rb atoms for K ones. The size and the spatial distribution of the s-electron wave function in the nanocluster play a key role in the exchange coupling., KOREAN PHYSICAL SOC
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2013年07月, ［査読有り］

Change of electronic state and crystal structure by postannealing in superconducting SrFe2(As0.65P0.35)2
T. Kobayashi; S. Miyasaka; S. Tajima; T. Nakano; Y. Nozue; N. Chikumoto; H. Nakao; R. Kumai; Y. Murakami, We investigated the annealing effects on the physical properties of SrFe2(As1-xPx)2(x=0.35). The superconducting transition temperature (Tc) increased from 26 to 33 K by annealing. The x-ray diffraction measurement suggested that the annealed crystals have the shorter/longer a/c axes and the larger pnictogen height h Pn. This must be linked to the Tc enhancement by annealing. Moreover, it was found that the postannealing decreased the electronic specific heat coefficient at T=0K,γr, and changed the magnetic field (H) dependence from sublinear γrâ ̂H0.7 to H linear γrâ̂H. This can be attributed the electronic change from dirty to clean superconductors with a s ± gap. © 2013 American Physical Society.
Physical Review B - Condensed Matter and Materials Physics, 2013年05月28日, ［査読有り］

NMR study of thermally activated paramagnetism in metallic low-silica X zeolite filled with sodium atoms
Mutsuo Igarashi; Takehito Nakano; Pham Tan Thi; Yasuo Nozue; Atsushi Goto; Kenjiro Hashi; Shinobu Ohki; Tadashi Shimizu; Andraz Krajnc; Peter Jeglic; Denis Arcon, We report a Na-23 and Al-27 nuclear magnetic resonance (NMR) investigation of low-silica X (LSX) zeolite with chemical formula Na12Al12Si12O48 (Na-12-LSX) loaded with n additional guest sodium atoms. Na-n/Na-12-LSX exhibits an insulator-to-metal transition around n = 11.6, which is accompanied by a significant enhancement of bulk magnetic susceptibility. Paramagnetic moments are in the metallic Na-12/Na-12-LSX thermally activated with an activation energy of around 0.1 eV. Simultaneously a new shifted component appears in the Na-23 NMR, whose large and positive NMR shift scales with bulk magnetic susceptibility. Its spin-lattice relaxation rate 1/T-1 is governed by the local-field fluctuations characterized by the same activation energy as obtained from the bulk magnetic susceptibility data. The time scale of these fluctuations is typical for atomic motions, which suggest strong electron-phonon coupling, a hallmark of polaron states. The insulator-to-metal transition in Na-n/Na-12-LSX is thus discussed within a polaron model. DOI: 10.1103/PhysRevB.87.075138, AMER PHYSICAL SOC
PHYSICAL REVIEW B, 2013年02月, ［査読有り］

ゼオライトの配列ナノ空間を利用したエキゾチックな電子系：スーパーアトム結晶
野末泰夫,中野岳仁, 責任著者, 日本ゼオライト学会
ゼオライト, 2013年, ［査読有り］

Insulating state and metallic phase transition of heavily sodium-doped low-silica X (LSX) zeolites
Yasuo Nozue; Yusaku Amako; Ryoko Kawano; Takahiro Mizukane; Takehito Nakano, Electrical resistivity was measured for Na-doped low-silica X (LSX) zeolite at various Na-loading densities. Many s-electrons are introduced into the regular array of zeolite nanocages by the loading of guest Na atoms. The average Na-loading density per unite cage, n, was changed from 0 to approximate to 12. Nonmagnetic and insulating properties are observed for n less than or similar to 11. A drastic decrease in the resistivity is observed at n approximate to 12, indicating that the insulating phase is changed to metallic one by the addition of less than one Na-atom per unite cage. At the same time, a remarkable increase in paramagnetic susceptibility is observed at room temperature. Insulating states are explained by spin-singlet clusters which are assigned to the self-trapped s-electron pairs (small bipolarons) due to the strong electron-phonon interaction against the Coulomb repulsive interaction between two s-electrons. Pairs of s-electrons occupy successively the quantum states of clusters in zeolite cages with increasing the Na-loading density. The metallic phase transition is explained by the formation of large polarons which are mobile over many cages through the zeolite windows. The increase in the paramagnetic susceptibility is explained by the thermal excitation of small polarons expected in the adiabatic potential. (C) 2012 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2012年12月, ［査読有り］

NMR property of rubidium loaded sodalite
M. Igarashi; T. Nakano; A. Goto; K. Hashi; T. Shimizu; A. Hanazawa; Y. Nozue, Al-27 NMR property of rubidium-loaded potassium-type sodalite, which has antiferromagnetic transition temperature T-N of 80 K, is reported. Similar to the case of potassium-loaded one, monotonous narrow spectrum is seen above T-N and broadened one is observed below T-N. Separately shifted component, which is seen in the case of sodium-loaded one, is not observed as the potassium-loaded one. When two Gaussian functions are used for fitting, widths of each Gaussian component fairly scale to each other. The ratio between two Gaussian widths takes close value to the case of potassium loading below 65 K and shows difference above 65 K. This difference comes from the raising of T-N by replacement of K to Rb. (C) 2011 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2012年12月, ［査読有り］

Direct Observation by Neutron Diffraction of Antiferromagnetic Ordering in s Electrons Confined in Regular Nanospace of Sodalite
Takehito Nakano; Masato Matsuura; Atsufumi Hanazawa; Kazuma Hirota; Yasuo Nozue, Sodium clusters formed in the regular nanospace of sodalite (aluminosilicate zeolite) are known to show antiferromagnetic order without any magnetic elements. The clusters are arrayed in a body centered cubic structure. We have performed a neutron diffraction study and succeeded in detecting the magnetic Bragg peaks of the s-electron spins for the first time. The observation of both 001 and 111 magnetic reflections confirms the antiferromagnetic order with the antiparallel coupling between the nearest neighbor clusters. The magnetic form factor was examined by analyzing the intensity ratios of the magnetic and nuclear Bragg peaks. The result is in good agreement with the shape of the s-electron wave function derived from theoretical studies of the sodium nanoclusters in the cages., AMER PHYSICAL SOC
PHYSICAL REVIEW LETTERS, 2012年10月, ［査読有り］

ゼオライト結晶のナノ細孔へのアルカリ金属圧入とエキゾチックな磁性　　　　　　　　　　　　　　　
中野岳仁,グエン・ホアング・ナム,荒木新吾,加賀山朋子,野末泰夫, 筆頭著者, 日本磁気学会
まぐね/Magnetics Jpn., 2012年07月, ［査読有り］

ゼオライト結晶のナノ細孔へのアルカリ金属圧入と電子状態
中野 岳仁; 荒木 新吾; 加賀山 朋子; 野末 泰夫, 筆頭著者, In this article, we have developed pressure loading technique to extend the loading density of guest alkali metals in nanoporous crystals of zeolites. Zeolite crystals have solid framework and open regular nanospace. In the nanocages of zeolite crystals, s-electrons provided by the guest alkali metals occupy quantum electronic states of clusters successively. Under the pressure by the use of the pressure medium of alkali metals, we have observed significant change in the magnetic properties, indicating that the pressure loading increases loading densities which are closely related to the s-electron occupation at the quantum states of clusters.
, 日本高圧力学会
高圧力の科学と技術 = The Review of high pressure science and technology, 2012年02月20日, ［査読有り］

Pressure loading of alkali-metal into nanopore of zeolite crystals and electronic states of nanoclusters
Takehito Nakano; Shingo Araki; Tomoko Kagayama; Yasuo Nozue, In this article, we have developed pressure loading technique to extend the loading density of guest alkali metals in nanoporous crystals of zeolites. Zeolite crystals have solid framework and open regular nanospace. In the nanocages of zeolite crystals, s-electrons provided by the guest alkali metals occupy quantum electronic states of clusters successively. Under the pressure by the use of the pressure medium of alkali metals, we have observed significant change in the magnetic properties, indicating that the pressure loading increases loading densities which are closely related to the s-electron occupation at the quantum states of clusters., Japan Society of High Pressure Science and Technology
Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, 2012年, ［査読有り］

Magnetoelectric Effect in an XY-like Spin Glass System NixMn1-xTiO3
Y. Yamaguchi; T. Nakano; Y. Nozue; T. Kimura, Magnetoelectric (ME) properties were investigated for an XY-like spin glass (SG) system, NixMn1-xTiO3 with an ilmenite structure. The ME effect is usually observed in systems with peculiar couplings between a crystal lattice and a magnetic order. Nonetheless, we found an antisymmetric ME effect with nonzero ME tensor elements below T-ME = 8-10 K in samples showing SG transitions. At T-ME, no specific heat anomaly was observed, suggesting the absence of long-range magnetic order. We discuss the origin of the ME effect in the XY-like SG system in terms of an alignment of toroidal moments., AMER PHYSICAL SOC
PHYSICAL REVIEW LETTERS, 2012年01月, ［査読有り］

Multiple Metamagnetic Transitions in Antiferromagnet Yb₂Pt₂Pb with the Shastry–Sutherland Lattice
Iwakawa Ken; Hirose Yusuke; Enoki Kentaro; Sugiyama Kiyohiro; Takeuchi Tetsuya; Honda Fuminori; Hagiwara Masayuki; Kindo Koichi; Nakano Takehito; Nozue Yasuo; Settai Rikio; Ōnuki Yoshichika, From the magnetization and magnetoresistance measurements, we constructed the magnetic phase diagram of Yb2Pt2Pb with the Shastry-Sutherland lattice, which consists of characteristic two phases below 1 K with many metamagnetic transitions, revealing magnetic frustrations., The Physical Society of Japan
Journal of the Physical Society of Japan, 2012年, ［査読有り］

Diffusion of muon in hydrogen tungsten bronze　　　　　　　　　　　　　　　
M. Mihara; K. Shimomura; I. Watanabe; D. Nishimura; J. Komurasaki; T. Suzuki; Y. Ishii; T. Kawamata; W. Sato; T. Nakano; K. Nishiyama; R. Kadono; S. Takai; M. K. Kubo; H. Matsue
RIKEN Accelerator Progress Report, 2011年, ［査読有り］

mu SR Study on Antiferromagnetism of Alkali-Metal Clusters Incorporated in Zeolite Sodalite
Takehito Nakano; Ryuichi Suehiro; Atsufumi Hanazawa; Kunihiro Watanabe; Isao Watanabe; Alex Amato; Francis L. Pratt; Yasuo Nozue, Na-4(3+) and K-4(3+) clusters arrayed in aluminosilicate sodalite are known to show antiferromagnetism below respective Neel temperatures T-N = 48 and similar or equal to 70K. We newly prepared K-Rb alloy (K3Rb)(3+) clusters in addition to Na-4(3+) and K-4(3+) ones, and performed muon-spin relaxation (mu SR) measurements. We find a large amplitude of precession signal in zero-field mu SR spectra, indicating that antiferromagnetism takes place in the major volume of the samples. The T-N is estimated from the temperature dependence of the precession signal to be similar or equal to 80K for (K3Rb)(3+). The internal field at the muon stopping site is estimated from the precession frequency to be similar or equal to 92, similar or equal to 142, and similar or equal to 155 Oe for Na-4(3+), K-4(3+), and (K3Rb)(3+), respectively. Therefore, T-N and the internal field are found to increase in the increasing order of atomic weight. These results are explained by the increase in the size of the s-electron wave function of clusters and the decrease in their potential depth., PHYSICAL SOC JAPAN
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2010年07月, ［査読有り］

Strong dependence of ferrimagnetic properties on Na concentration in Na-K alloy clusters incorporated in low-silica X zeolite
Duong Thi Hanh; Takehito Nakano; Yasuo Nozue, Na concentration (x) dependence of ferrimagnetic properties is investigated for Na-K alloy clusters incorporated in low-silica X (LSX) zeolite. In the LSX zeolite, beta-cages. of inner diameter approximate to 7 angstrom are arranged in a diamond structure, and supercages of inner diameter approximate to 13 angstrom are formed among them. The used LSX zeolite contains xNa(+) and (12 - x)K(+) cations per beta-cage or supercage. Guest nK atoms are loaded into the zeolite, namely the loading density is given by n per beta-cage. The samples at x=4 have been reported to show Neel's N-type ferrimagnetism in the specific region of n. This ferrimagnetism is explained by the model of antiferromagnetic coupling between two non-equivalent magnetic sublattices of clusters, the ones in beta-cages and the others in supercages. In the present study, the value of x is changed from 4 to 0. Ferrimagnetic properties are found to show strong x-dependence. A systematic increase in loading densities of ferrimagnetic region is clearly observed with decreasing x. A remarkable change in temperature dependence of spontaneous magnetization is observed depending on x. Na(+) cations are known to be mainly distributed in beta-cages. Hence, the decrease in Na concentration is proposed to change the electronic potential depth for clusters in beta-cage, which leads to important differences in the interaction between electrons localized in beta-cages and those in supercages. (C) 2009 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010年04月, ［査読有り］

Insulating state of Na clusters and their metallic transition in low-silica X zeolite
Takehito Nakano; Takahiro Mizukane; Yasuo Nozue, Optical and magnetic properties are investigated for low-silica X (LSX) zeolite. loaded with Na metals at various loading densities. In LSX, beta-cages with the inside diameter of similar to 7 angstrom are arrayed in a diamond structure and the supercages with that of similar to 13 angstrom are formed among them. When the average number of guest Na atoms per beta cage, n, is smaller than similar to 2, optical reflectance shows a peak at similar to 2.5 eV. This corresponds to the 1s-1p transition of the cluster formed in beta cage. At n > 2, this peak disappears and several strong peaks are seen at 1-3 eV. The oscillator strength increases with n. They can be attributed to surface-plasmon-like excitations of the Na clusters formed in supercages. At n <= 10, clear absorption tails with energy gaps are observed at near IR region indicating insulating states. However, when n is increased up to similar to 12, a clear Drude reflection suddenly appears in the IR region, indicating that an insulator-to-metal transition abruptly occurs. This dramatic change of the electronic state may be caused by the successive connection between adjacent clusters in supercages due to some special arrangement of Na(+) ions as well as the delocalized wave function of electrons at high Na-loading density. (C) 2009 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010年04月, ［査読有り］

NMR property of sodalite loaded with potassium
M. Igarashi; T. Nakano; A. Goto; K. Hashi; T. Shimizu; A. Hanazawa; Y. Nozue, (27)Al NMR property of potassium-loaded sodalite, which shows antiferromagnetic transition around 70 K. is reported. Monotonic narrow spectrum above 70 K is broadened below 70 K. The broadened spectrum is analyzed with an assumption that the broadening is given by dipolar field from magnetic moment in the cage of sodalite. Two Gaussian functions are used for fitting. Widths of each component proportionally scale each other. The ratio between the Gaussian widths of each component of the narrower and the broader components is 15 +/- 3. (C) 2009 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010年04月, ［査読有り］

Antiferromagnetic resonance study of sodalite loaded with sodium by multi-frequency ESR
T. Kashiwagi; T. Nakano; A. Hanazawa; Y. Nozue; M. Hagiwara, We have carried out electron spin resonance (ESR) measurements on powder samples of sodalite loaded with Na at several frequencies between 9.7 and 35 GHz and at temperatures between 1.5 and 60 K. The ESR absorption spectrum below a Neel temperature T(N) turns into an asymmetric spectrum with a long tail at low fields from a symmetric one above T(N). The line shape of the spectra below T(N) is analyzed by a powder pattern simulation of the antiferromagnetic resonance spectra with easy-plane anisotropy. The calculated line shape reproduces the experimental one considerably well by assuming a Gaussian distribution of the zero-field energy gap. We have evaluated a small anisotropy field of about 2 x 10(-4) T by using the exchange coupling constant calculated from the Weiss and the Ne! temperatures. This result indicates that the sodalite loaded with Na is quite an ideal Heisenberg antiferromagnet as expected from the s-electron character of Na clusters and the cubic arrangement of nano-spaces in the sodalite. (C) 2009 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010年04月, ［査読有り］

µSR study on ferromagnetism of rubidium clusters in zeolite A　　　　　　　　　　　　　　　
T. C. Duan; T. Nakano; J. Matsumoto; R. Suehiro; I. Watanabe; T. Suzuki; T. Kawamata; A. Amato; F. L. Pratt; Y. Nozue
RIKEN Accelerator Progress Report, 2010年, ［査読有り］

Ionothermal synthesis of extra-large-pore open-framework nickel phosphite 5H3O·[Ni8(HPO3)9Cl3]·1.5H2O: magnetic anisotropy of the antiferromagnetism
H. Xing; W. Yang; T. Su; Y. Li; J. Xu; T. Nakano; J. Yu; R. Xu, WILEY-BLACKWELL
Angewandte Chemie International Edition, 2010年, ［査読有り］

Antiferromagnetic Resonance in Sodium Clusters in Sodalite
Nakano Takehito; Kashiwagi Takanari; Hanazawa Atsufumi; Watanabe Kunihiro; Hagiwara Masayuki; Nozue Yasuo, 筆頭著者, Sodium clusters arrayed in aluminosilicate sodalite are known to show antiferromagnetism below the Néel temperature $T_{\text{N } }$ of 48 K. We have performed electron spin resonance (ESR) measurements on a powder specimen of this material at an X-band microwave frequency (9.7 GHz) with temperature varying between 4 and 300 K. The ESR spectra show asymmetric broadening below $T_{\text{N } }$, which can be regarded as a powder pattern of the antiferromagnetic resonance (AFMR) signal. From the analysis of the AFMR fields at low temperatures using the exchange-coupling constants evaluated from the magnetic susceptibility, the anisotropy field is estimated to be significantly small at about 1–2 Oe. These results indicate that this material is an ideal Heisenberg antiferromagnet resulting from the character of s-electrons in zeolite cages with a cubic arrangement., Physical Society of Japan
J Phys Soc Jpn, 2009年08月15日, ［査読有り］

Fast muon spin relaxation in ferromagnetism of potassium clusters in zeolite A
Takehito Nakano; Jun Matsumoto; Truong Cong Duan; Isao Watanabe; Takao Suzuki; Takayuki Kawamata; Alex Amato; Francis L. Pratt; Yasuo Nozue, Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperatures. A remarkable decrease in the initial asymmetry was observed previously below the Curie temperature in zero-field mu SR by using pulsed muons. In the present work by using dc muons, we clearly observed the fast decay component which was assigned to the decrease in the initial asymmetry in the previous pulsed muon experiment. The relaxation rate amounts to similar or equal to 20 mu s(-1) which corresponds to similar or equal to 200 Oe in the random static field. This value cannot be explained by the ordinary dipole field, but by the Fermi-contact interaction with electrons in K clusters. The fast decay is easily quenched by applying a weak longitudinal field of similar or equal to 10 Oe. The low field decoupling of the fast decay component can be explained by the magnetization by the spin-canting mechanism of antiferromagnet under the assumption that some muons stop near the oxygen in 8-membered ring of zeolite framework. (C) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA B-CONDENSED MATTER, 2009年04月, ［査読有り］

μSR Study on Ferromagnetic Properties of Rb Clusters Incorporated into Zeolite A
T.C. Duan; T. Nakano; J. Matsumoto; R. Suehiro; I. Watanabe; T. Suzuki; T. Kawamata; A. Amato; F.L. Pratt; Y. Nozue, We performed mu SR experiments on rubidium clusters arrayed in porous crystals of zeolite A. These clusters are known to show spontaneous magnetization of ferromagnetism at higher loading densities of Rb atoms in a previous study. The development of the internal field is observed below similar or equal to 4 K in the temperature dependence of zero-field mu SR spectra in the sample n = 5.8, where n is the average loading density of Rb atoms per unit cage. The Curie temperature of this sample is estimated to be similar or equal to 5 K from the Arrott plot analysis. The amplitude of the relaxation is large enough to indicate the magnetic ordering in the major volume of sample. The internal field is confirmed to be almost static in the longitudinal-field mu SR spectra below similar or equal to 4K Difference of the ferromagnetic properties between K and Rb clusters is also discussed from the viewpoint of mu SR study. (C) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Physica B, 2009年04月, ［査読有り］

Muon spin relaxation in hydrogen tungsten bronze
M. Mihara; K. Shimomura; I. Watanabe; Y. Ishii; T. Suzuki; T. Kawamata; J. Komurasaki; D. Nishimura; K. Nishiyama; R. Kadono; S. Takai; T. Nakano, The zero-field muon spin relaxation in hydrogen tungsten bronze H(x)WO(3) was observed at temperatures between 5 K and 440 K in order to study the diffusion property of muons. The result shows that the relaxation curves are nearly identical at temperatures lower than 100 K and at above 100 K the relaxation rate becomes slower with increasing temperature. The local field and its fluctuation at a muon site in H(x)WO(3) were estimated from the present data. (c) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA B-CONDENSED MATTER, 2009年04月, ［査読有り］

Neutron magnetic scattering studies on ferromagnetism in potassium nanoclusters arrayed in zeolite A-Trial experiments
T. Nakano; T. Takase; S. Araki; T. Kamiyama; Y. Nozue; S. Ikeda, Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however. obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher SIN of similar to 10(4) or more is required to detect the magnetic scattering of this material. (c) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2009年02月, ［査読有り］

Coloration using higher order optical interference in the wing pattern of the Madagascan sunset moth
S. Yoshioka; T. Nakano; Y. Nozue; S. Kinoshita, Colour patterns of animals' bodies are usually produced by the spatial distribution of pigments with different colours. However, some animals use the spatial variation of colour-producing microstructures. We have studied one distinctive example of such structurally produced colour patterns, the wing of the Madagascan sunset moth, to clarify the physical rules that underlie the colour variation. It is known that the iridescent wing scale of the sunset moth has the alternate air cuticle multilayer structure that causes optical interference. The microscopic and optical investigations of various parts of the wing have confirmed that the thickness of the cuticle layers within the scale largely varies to produce the colour pattern. However, it varies in very different ways between the dorsal and ventral sides of the hind wing; the thickness gradually varies on the dorsal side from scale to scale, while the abrupt changes are found on the ventral side to form distinctive borders between differently coloured areas. It is also revealed that an unusual coloration mechanism is involved in the green part of the ventral hind wing: the colour is caused by higher order optical interference of the highly non-ideal multilayer structure. The physical mechanism of the colour pattern formation is briefly discussed with the several mathematical models proposed so far., ROYAL SOC
JOURNAL OF THE ROYAL SOCIETY INTERFACE, 2008年04月, ［査読有り］

Orbital degeneracy and magnetic properties of potassium clusters incorporated into nanoporous crystals of zeolite A　　　　　　　　　　　　　　　
T. Nakano; Y. Nozue, 筆頭著者
Journal of Computational Methods in Science and Engineering, 2007年09月06日, ［査読有り］

Anomalous magnetization of potassium clusters incorporated into zeolite A at high magnetic field
Takehito Nakano; Daisuke Kiniwa; Akira Matsuo; Koichi Kindo; Yasuo Nozue, Magnetization process of potassium clusters arrayed in cages of zeolite A (framework type code LTA) is measured up to 52 T by using a pulsed magnet. This material is known to show ferromagnetism at certain numbers of guest potassium atoms (or s-electrons) per cluster. We observe an anomalously large magnetization at higher fields at low temperatures. The level crossing of LS multiplet terms in the degenerate lp-like orbital of potassium cluster is discussed as a possible origin of the anomalous increase in the magnetization at higher fields. (c) 2006 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2007年03月, ［査読有り］

Evidence for ferromagnetism in rubidium clusters incorporated into zeolite A
Truong Cong Duan; Takehito Nakano; Yasuo Nozue, Magnetic properties are studied on Rb clusters generated in the cages of zeolite A (framework type code LTA), where the cages with an inside diameter of similar to 11 angstrom are arrayed in a simple cubic structure. When the average number of s-electrons per cluster, n, is larger than similar to 4, ferromagnetic properties are newly observed at low temperatures. The Curie temperature is estimated to be similar to 3.5K at n = 5.0 from the Arrott-plot analysis. The magnetic susceptibility shows Curie-Weiss law with a negative Weiss temperature, T-W, of about -25K, indicating that the coupling between magnetic moments of clusters is antiferromagnetic. Possible origins of the ferromagnetism in Rb clusters are discussed. (c) 2006 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2007年03月, ［査読有り］

NMR property of low silica X zeolite system with incorporated potassium clusters
M. Igarashi; T. Nakano; T. Shimizu; A. Goto; K. Hashi; K. Goto; K. Yamamichi; and Y. Nozue, Na-23- and Al-27- NMR spectra between 300 and 4K of a potassium-loaded low silica X zeolite which shows ferrimagnetism. are obtained. For Na-23, positively shifted components are observed on the spectrum other than an unshifted one. We consider that those shifted components are given by the hyperfine interaction between the magnetic electrons in cages and Na-23 nuclei, which are located at several sites inside of the cages. On the other hand, like the case of zeolite A with Rb cluster, Al-27 shows symmetrically widened spectrum but gives no apparent shift. We consider that this feature is revealed by the coupling only through the dipolar interaction between the magnetic electrons and the Al-27 nuclei. (c) 2006 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Magnetism and Magnetic Materials, 2007年03月, ［査読有り］

Anomalous property of the spin-spin relaxation of Al-27 NMR in dehydrated zeolite A
M. Igarashi; T. Kodaira; T. Shimizu; A. Goto; K. Hashi; T. Nakano; Y. Nozue, Anomalous temperature dependence of T-2 for Al-27 NMR in dehydrated zeolite A is found. T-2 of the satellite transition shows a minimum around 75 K and a rapid decrease below 140 K, in spite that T-2 of the central transition changes gradually. Since T-1 shows monotonous dependence on temperature for both transitions below 140 K, the anomaly of T-2 cannot be caused by the fluctuation of the local magnetic field. Some lattice dynamics which reveal coherence only among the satellite transitions, such as an alternation of the electrical field gradient, may be an origin of those behaviors. (c) 2007 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
CHEMICAL PHYSICS LETTERS, 2007年02月, ［査読有り］

Magnetic and optical properties of Rb and Cs clusters incorporated into zeolite A
Truong Cong Duan; Takehito Nakano; Yasuo Nozue, Optical and magnetic properties are studied on Rb and Cs clusters incorporated into the cages of aluminosilicate zeolite A (structure type code LTA), where α and β cages with inside diameters of ∼1.1 and ∼0.7 nm, respectively, are arrayed in a simple cubic structure. The average number of guest alkali atoms per α cage, n, was changed from dilute loading to ∼5 and ∼3.5 for Rb and Cs, respectively. At n >
2, the absorption coefficient at mid-infrared region increases significantly. This is assigned to a contribution of the Drude term in a metallic phase. The change from insulating phase to the metallic one is ascribed to a wider bandwidth of the 1p state of clusters compared with that of the 1s state. All samples show Curie-Weiss law with negative Weiss temperatures. In Rb clusters, both of the Curie constant and the absolute value of Weiss temperature gradually increases with increasing n at n >
2, and ferromagnetic properties are clearly found at n >
4. This n-dependence is essentially different from that in ferromagnetism in K clusters at n >
2. Cs clusters shows quite small values of Curie constant at n >
2 and also non-ferromagnetic behavior up to the maximum value of n. © 2007 The Surface Science Society of Japan., 公益社団法人 日本表面科学会
e-Journal of Surface Science and Nanotechnology, 2007年01月15日, ［査読有り］

Far infrared micro spectroscopy of zeolite MOR single crystal
Y. Ikemoto; T. Moriwaki; T. Nakano; Y. Nozue, Mordenite (structure type MOR) is one of nano-porous crystals of aluminosilicate zeolites. The framework of mordenite has one-dimensional channels along the c-axis. Cations, such as Na, are distributed at the side pockets of channels. We measured polarized far infrared absorption spectra of Na-type mordenite single crystals with the size of less than similar to 100 mu m. The measurements were performed by the microspectroscopy station of BL43IR at SPring-8. The polarization directions are set for parallel and perpendicular to the c-axis. The polarization dependence is observed clearly in the spectra. Absorption peaks are observed at 140 and 320 cm(-1) for parallel polarization and at 170 and 280 cm(-1) for perpendicular polarization. They are assigned to the anisotropic motion of Na cations and framework. The spectra are compared with the ordinary absorption spectra of the pellet forms of Na-, Rb- and H-type mordenite powders. (c) 2006 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
INFRARED PHYSICS & TECHNOLOGY, 2006年09月, ［査読有り］

μSR Study on Ferrimagnetic Properties of Potassium Clusters Incorporated into Low Silica X Zeolite
T. Nakano; K. Goto; I. Watanabe; F.L. Pratt; Y. Ikemoto; Y. Nozue, Potassium clusters are stabilized in the cages of low silica X zeolite, where the cages with the inside diameter of similar to 13 angstrom are arrayed in a diamond structure. The average number of potassium atoms per cage, n, is changed from similar to 6.3 to the saturated value of similar to 8.8 by controlling the guest potassium loading density. The temperature dependence of magnetization shows the typical behavior of the N-type ferrimagnetism at n similar to 6.8 and n similar to 8.3. The zero field mu SR spectra show significant increase in the relaxation rate below the Curie temperature, 5 K, in the sample with n similar to 6.8. The time dependence of asymmetry shows almost full amplitude of decrease, indicating that the internal field below the magnetic phase transition arises in the almost full volume of the sample. The longitudinal field mu SR spectra at 1.7 K show the typical decoupling behavior of a static internal field. A model of ferrimagnetism is proposed based on the structure of the zeolite, where a magnetic sublattice of itinerant electron ferromagnetism is assumed. (c) 2005 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Physica B, 2006年03月, ［査読有り］

Muonium formation in porous crystal of zeolite X
T Nakano; K Goto; FL Pratt; Watanabe, I; Y Nozue, A significant decrease in the initial asymmetry of zero-field mu SR spectra is observed in dehydrated (nonloaded) zeolite X measured by using pulsed positive-muon beam. This result indicates an effective muonium (Mu) formation in the zeolite crystal. The Mu formation rate is estimated to be similar to 40% of the implanted muons. From the analysis of the longitudinal-field decoupling behavior, the hyperfine field of the Mu is estimated to be 1530 +/- 100 Oe. This value is quite close to that for Mu in vacuum (similar to 1580 Oe), indicating that the electron in Mu scarcely hybridizes with the electronic states of zeolite framework. We also observe the significant suppression of Mu formation by the loading of guest potassium atoms into zeolite X. The interaction between the electron in Mu and electrons in potassium cluster in the zeolite cage may play an important role for the suppression of Mu formation. (c) 2005 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA B-CONDENSED MATTER, 2006年03月, ［査読有り］

Soft x-ray spectroscopy of Ba24Ge100: Electronic phase transition and Ba-atom rattling
T Rachi; M Kitajima; K Kobayashi; FZ Guo; T Nakano; Y Ikemoto; K Kobayashi; K Tanigaki, The electronic states of Ba24Ge100 are studied by soft x-ray photoelectron spectroscopy (XPS) at a high-energy photon factory. A large reduction in the density of states (DOS) at the Fermi level is clearly shown before and after the electronic phase transition at 200 K. The changes in the spectrum widths and the fine structures of the core-level Ba 4d spectra give a very reasonable indication of the Ba-atom rattlings in the clathrate polyhedra. On-resonance experiments using the excitation from Ba 3d to 4f levels display that the wave functions of Ba 5d and 6s orbitals give only a small contribution to make a Fermi surface through the hybridization with the Ge-20 cluster orbitals. Importantly, reliable values of the DOS at the Fermi level N-EF are successfully deduced, using two data sets of DOS obtained from high-resolution XPS and the total magnetic susceptibilities by a superconducting quantum interference device, to be 0.149 and 0.0427 states eV(-1) (Ge atom)(-1) for a high-temperature and for a low-temperature phase., AMER INST PHYSICS
JOURNAL OF CHEMICAL PHYSICS, 2005年08月, ［査読有り］

Role of Ag doping in silicon clathrate compounds
N. Kamakura; T. Nakano; Y. Ikemoto; M. Usuda; H. Fukuoka; S. Yamanaka; S. Shin and K. Kobayashi, The silicon clathrate compound Ba8Si46 shows superconductivity below the critical temperature (T-c) of 8 K, and the T-c decreases monotonically with doping Ag. In order to reveal effects of Ag doping on the electronic states, we have applied soft x-ray photoemission spectroscopy to Ag-doped silicon clathrate compounds Ba8AgxSi46-x (x=0,1,3,6). The valence band photoemission spectra show that a Ba 5d-derived state at the Fermi level (E-F), which is prominently observed in Ba8Si46, decreases with increasing Ag content. The reduction in the peak intensity at E-F with increasing Ag content is therefore in accord with the decrease of T-c in Ba8AgxSi46-x. Band structure calculation using local-density approximation reproduces the observed valence band spectra of x=0 and 6. The Si 2p and Ba 4d core-level photoemission spectra demonstrate that the valence electron of Si is attracted to the Ag site in x=1 and the 5d electron of Ba inside the Si-24 cage is further donated to Ag in x >= 3. Hence, Ag doping leads to the reduction of the peak at E-F., AMER PHYSICAL SOC
Physical Review B, 2005年07月07日, ［査読有り］

Role of Ag doping in Ba8Si46 compounds
N. Kamakura; T. Nakano; Y. Ikemoto; M. Usuda; H. Fukuoka; S. Yamanaka; S. Shin; K. Kobayashi, The silicon clathrate compound Ba8Si46 shows superconductivity below the critical temperature (Tc) of 8K, and the Tc decreases monotonically with doping Ag. In order to reveal effects of Ag doping on the electronic states, we have applied soft x-ray photoemission spectroscopy to Ag-doped silicon clathrate compounds Ba8AgxSi46-x (x=0,1,3,6). The valence band photoemission spectra show that a Ba 5d-derived state at the Fermi level (EF), which is prominently observed in Ba8Si46, decreases with increasing Ag content. The reduction in the peak intensity at EF with increasing Ag content is therefore in accord with the decrease of Tc in Ba8AgxSi46-x. Band structure calculation using local-density approximation reproduces the observed valence band spectra of x=0 and 6. The Si 2p and Ba 4d core-level photoemission spectra demonstrate that the valence electron of Si is attracted to the Ag site in x=1 and the 5d electron of Ba inside the Si24 cage is further donated to Ag in x≥3. Hence, Ag doping leads to the reduction of the peak at EF. © 2005 The American Physical Society.
Physical Review B - Condensed Matter and Materials Physics, 2005年, ［査読有り］

ゼオライトFAU (LowSilica X) 中のカリウムクラスターのフェリ磁性
中野岳仁, 筆頭著者, ナノ学会
ナノ学会会報 (Bulletin of the Society of Nano Science and Technology), 2005年, ［査読有り］

Spin-cant model of ferromagnetism in potassium clusters incorporated in zeolite LTA
T Nakano; D Kiniwa; Y Ikemoto; Y Nozue, The magnetization process of potassium clusters arrayed in zeolite LTA is measured up to 14 T. This material shows ferromagnetism at certain concentrations of potassium atoms in cluster. The magnetization at ferromagnetic concentrations increases linearly with the applied magnetic field at higher fields. This result is well explained by a spincant model of antiferromagnet. A largeness of an estimated spin-cant angle is assigned to the Dzyaloshinsky-Moriya interaction strongly enhanced by the degeneracy of 1p-orbital of cluster. (C) 2003 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004年05月, ［査読有り］

μSR Study of Ferromagnetism in Potassium Clusters Incorporated in Zeolite LTA
D. Kiniwa; T. Nakano; F.L. Pratt; I. Watanabe; Y. Ikemoto; Y. Nozue, muSR has been studied for a ferromagnetic sample of K clusters in zeolite LTA as a function of longitudinal field (LF) and temperature. Under weak LF a non-relaxing asymmetry component is produced at low temperatures, whereas at higher temperatures in the paramagnetic state a two-component relaxation is clearly observed. The data are successfully explained by assuming two different muon-stopping sites in the cubic antiferromagnet, along with a canting of the spin structure. (C) 2003 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Magnetism and Magnetic Materials, 2004年05月, ［査読有り］

Optical and Magnetic Properties of Rb and Cs Clusters Incorporated in Cages of Aluminosilicate Zeolite LTA　　　　　　　　　　　　　　　
Truong Cong Duan; Takehito Nakano; Yasuo Nozue
Proceedings of The Ninth Asia Pacific Physics Conference (9th APPC), 2004年, ［査読有り］

μSR Study on Ferromagnetism of Potassium Clusters in Aluminosilicate Zeolite LTA
T. Nakano; D. Kiniwa; F.L. Pratt; I. Watanabe; Y. Ikemoto; Y. Nozue, Potassium clusters stabilized in regular cages of alummosilicate zeolite LTA are known to show ferromagnetic properties depending on the loading density of guest K atoms. In the present paper, a muon spin rotation/relaxation ( muSR) experiment is reported for a sample at a K-loading density of 4.8 atoms per Cage. This sample shows ferromagnetic properties below 6.5K. An increase in the muon spin depolarization rate, a decrease in the initial asymmetry and an appearance of the muon spin precession sipal are all observed at low temperatures in the zero field. The internal magnetic field distribution is roughly estimated from the depolarization rate and the precession frequency. Possible magnetic structures are discussed in comparison with the internal field distribution. A recovery of the initial asymmetry is observed for very weak longitudinal field (LF). This behavior is ascribed to the reorientation of spontaneous magnetization along LF. The present result is discussed in relation to the spin-canting model. (C) 2002 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
Physica B, 2003年02月, ［査読有り］

Substitution effects on ferromagnetic Mott insulator Lu2V2O7
S Shamoto; T Nakano; Y Nozue; T Kajitani, A model is proposed for the ferromagnetism of a Mott insulator Lu2V2O7. In relation to this model, substitution effects of Ti and Nb atoms for V atoms in Lu2V2O7 have been studied, where all ions are found to have valence of +4, i.e. S = 1/2 for V4+, S = 0 for Ti4+ and S = 1/2 for Nb4+ as a localized spin by studying their lattice parameters and Curie constants. Saturated magnetic moments in Lu2V2-xNbxO7 system are smaller than paramagnetic moments in Curie-Weiss law, indicating spin canting or anisotropy. Its effect on Curie temperature T-c corresponds to the decrease of mean magnetic moments along the magnetic field, while the effect of Ti substitution on T-c is explained by the decrease of number of the nearest neighbor spins. These substitution effects on T-c do not contradict the present model. (C) 2002 Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2002年06月, ［査読有り］

Electron Spin Resonance Study and Orbital Degeneracy of Potassium Clusters in Zeolite LTA
Takehito Nakano; Yuka Ikemoto; Yasuo Nozue, Elect Ton spin resonance studies are carried out for potassium clusters stabilized in cages of aluminosilicate zeolite LTA, where cages are arrayed in a simple cubic structure, The average number of s-electrons per cluster, n, is systematically changed from 0 to the saturated value of congruent to 7.2. For samples at 2 < n, where s-electrcrns occupy the 1p-state of K cluster, the g value decreases remarkably from 2, indicating that an enhancement of the spin-orbit interaction occurs clue to the orbital degeneracy of the 1p-state. Simultaneously, ferromagnetism is observed for samples at 2 < n. The origin of the ferromagnetism is assigned to the orbital degeneracy of 1p-state followed by the enhancement of the Dzyaloshinsky-Moriya interaction between adjacent K clusters., PHYSICAL SOC JAPAN
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002年01月, ［査読有り］

配列ナノ空間における相関s電子系－ゼオライト結晶中のアルカリ金属クラスター－
野末泰夫,中野岳仁, ラスト(シニア)オーサー, アグネ技術センタ-
固体物理＜相関電子系の物質設計＞ 特集号, 2001年10月15日, ［査読有り］

Ferromagnetic properties of rubidium clusters in zeolite LTA
T Nakano; Y Ikemoto; Y Nozue, Magnetic and optical properties of Rb clusters in aluminosilicate zeolite LTA are investigated in detail. These clusters are stabilized in supercages arrayed in a simple cubic structure. The average number of s-electrons confined in each cluster, n, is changed up to the nearly saturated value similar to 4.6. At n > 2, the absolute value of the negative Weiss temperature increases with increasing n. In saturated samples at n similar to 4.6, ferromagnetic properties are observed below the asymptotic Curie temperature 3 K, but the fraction of the spontaneous magnetization is found to be very small and incomplete. Magnetic properties are different from those of K clusters in LTA, and discussed in relation to residual K cations. (C) 2001 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2001年05月, ［査読有り］

Insulating phase of potassium clusters arrayed in low-silica-type zeolite FAU
Y Ikemoto; T Nakano; M Kuno; Y Nozue; T Ikeda, Mutually interacting potassium clusters stabilized in supercages of aluminosilicate zeolite FAU (Si/Al = 1). the so-called low-silica X, are investigated in terms of optical and magnetic properties. FAU is ion-exchanged to K, and denoted by K-FAU(1), hereafter. When metal K is adsorbed at the average loading density of 0.7 +/- 0.3 atom per supercage of FAU, the observed infrared absorption is more than one order weaker than that in similarly K-loaded samples of K-FAU(1.25) which is called X commonly. The Weiss temperature in K-loaded K-FAU(1) is - 33 +/- 3 K. This value is several times larger than that in K-loaded K-FAU(1.25). The Mott insulator phase in K clusters in FAU(1), is thought to be realized differently from the metallic phase of K-FAU(1.25). (C) 2001 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2001年05月, ［査読有り］

Light-induced metal-insulator transition in Lu2V2O7
S Shamoto; H Tazawa; Y Ono; T Nakano; Y Nozue; T Kajitani, Ferromagnetic Mott-Hubbard insulator Lu2V2O7 has been studied under continuous Ar laser irradiation. One of the photon energies, i.e. E = 2.41 eV, corresponds to a transition from the lower Hubbard band of the V 3d orbital to the upper Hubbard band. Upon cooling, the activation-type electrical resistivity shows an anomalous drop within the temperature range of 70-130 K. Below the transition temperature, the resistivity shows no appreciable temperature dependence. The temperature increase due to the laser heating is estimated to be within the range of 15-35 K, which cannot be responsible for the observed anomalous drop of the resistivity. The metal-insulator transition is discussed in connection with the ferromagnetism of the present compound. (C) 2000 Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2001年01月, ［査読有り］

Magnetic Property of Potassium Clusters in Low-Silica Type Zeolite FAU　　　　　　　　　　　　　　　
Y. Ikemoto; T. Nakano; M. Kuno; Y. Nozue
Trans. Mat. Res. Soc. Jpn., 2001年, ［査読有り］

Loading density dependence of ferromagnetic properties in potassium clusters arrayed in a simple cubic structure in zeolite LTA
T Nakano; Y Ikemoto; Y Nozue, Magnetic properties are investigated for potassium clusters arrayed in zeolite LTA. The pc,potassium loading density per cluster. n, is changed up to 7.2 per cluster. The n-dependence of the Curie constant and the magnetization are measured in detail. Possible origins of ferromagnetic properties are discussed. (C) 2000 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA B, 2000年06月, ［査読有り］

Magnetic and optical properties of K and Na clusters arrayed in a diamond structure in zeolite FAU
Y Ikemoto; T Nakano; M Kuno; Y Nozue, K and Na clusters are generated in zeolite FAU with an Si-to-Al ratio of 1.25. We measured magnetic susceptibility, electron-spin resonance spectrum and the optical one. Observed magnetic properties are discussed from the viewpoint of the correlated electrons and/or the narrow energy band with a properly localized nature of clusters, together with a finite disorder effect. (C) 2000 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
PHYSICA B, 2000年06月, ［査読有り］

Magnetic Properties Near the Ferromagnetic-Nonferromagnetic Phase Boundary in Potassium Clusters Incorporated into Zeolite LTA
T. Nakano; Y. Ikemoto and Y. Nozue, 筆頭著者, Magnetic and optical properties an investigated for K clusters incorporated into zeolite LTA at loading densities of K atoms, n, between 1.0 and 3.2 per duster. No magnetic ordering is observed at n < 2. The spontaneous magnetization due to ferromagnetism is observed suddenly at n > 2. It is confirmed that the 1p-like quantum electronic stare of K cluster plays an essential role in the ferromagnetic phase., GORDON BREACH SCI PUBL LTD
Molecular Crystals and Liquid Crystals, 2000年, ［査読有り］

Optical and ESR Studies of Na Clusters in Zeolite FAU
Y. Ikemoto; T. Nakano; M. Kuno and Y. Nozue, Na clusters are generated in zeolite FAU with Si-to-Al ratios of 2.8 (Y-type) and 1.25 (X-type). When the density of adsorbed Na atoms increases, the ESR spectrum with hyperfine structures becomes narrow into a single line. In the IR absorption spectrum, no Drude-like absorption is observed at any adsorption densities of Na atoms. The ESR narrowing is explained by the mean field theory of the exchange narrowing given by Anderson and Weiss, by using the experimentally observed antiferromagnetic exchange coupling energy between magnetic moments of clusters., GORDON BREACH SCI PUBL LTD
Molecular Crystals and Liquid Crystals, 2000年, ［査読有り］

Ferromagnetism and paramagnetism in potassium clusters incorporated in zeolite LTA
T Nakano; Y Ikemoto; Y Nozue, Magnetic and optical properties are investigated for potassium clusters incorporated in zeolite LTA at loading densities of K atoms between 3.5 and 7.2 per cluster, the latter of which is saturated. The Curie-Weiss law with negative Weiss temperature -35 EC is seen at 3.5 atoms per cluster, and gradually approaches the Curie law as the loading density increases up to 7.2 atoms per cluster. The Curie temperature, similar to 8 K at 3.5 atoms per cluster, approaches 0 K at 7.2 atoms per cluster. These results suggest that the antiferromagnetic coupling between localized magnetic moments of K clusters decreases with increasing K-loading density, and almost disappears at the K-loading density of 7.2 atoms per cluster. The insulator-like absorption tail is observed in the infrared region at any loading density, indicating that K clusters in LTA are in the Mott insulator phase. The average magnetic moment estimated from the saturation magnetization remarkably increases from 0.25 to 0.15 mu g per cluster as loading density increases from 3.5 to 7.2 atoms per cluster. On the contrary, the average magnetic moment estimated from the Curie constant is similar to 1.6 mu(B) per cluster, and almost independent of the loading density. The explanation of these magnetic properties by the model of ferrimagnetism proposed in a previous paper proves difficult., SPRINGER VERLAG
EUROPEAN PHYSICAL JOURNAL D, 1999年12月, ［査読有り］

Metal-Insulator Transition of Potassium Clusters in KX　　　　　　　　　　　　　　　
Y. Ikemoto; T. Nakano; Y. Nozue
Proceedings of the 12th International Zeolite Conference, 1999年, ［査読有り］

ゼオライト中に配列したアルカリ金属クラスターの物性　　　　　　　　　　　　　　　
池本夕佳,中野岳仁,野末泰夫
超微粒子とクラスター(Bull. Cluster Sci. Tech.), 1997年09月, ［査読有り］

配列したアルカリ金属クラスターの物性－ゼオライト結晶を用いたナノスケール新物質－
野末泰夫,池本夕佳,中野岳仁, ラスト(シニア)オーサー, アグネ技術センタ-
固体物理, 1997年08月15日, ［査読有り］

Optical studies of nanoscale materials incorporated in the space of zeolite crystals
Y Ikemoto; T Nakano; Y Nozue; O Terasaki; S Qiu, Optical spectroscopy is used for the characterization of the quantum electronic state of nanoscale materials incorporated in zeolite crystals. Alkali metal clusters generated in zeolite exhibit interesting phenomena in optical properties as well as magnetic ones. Potassium clusters incorporated in zeolite LTA have shown ferromagnetism at low temperatures. The origin of the ferromagnetism was explained by the itinerant electron model. The infrared spectrum and magnetization curves, however, suggest that the itinerant electron model is not applicable to the ferromagnetism. Magnetic properties are interpreted based on the model of ferrimagnetism. Polarized micro-optical spectroscopy suggests the possibility of the one-dimensional array of potassium clusters in zeolite MOR single crystal. (C) 1997 Elsevier Science S.A., ELSEVIER SCIENCE SA LAUSANNE
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 1997年08月, ［査読有り］

Microoptical Spectroscopy of Potassium Adsorbed in Channel-Type Zeolite　　　　　　　　　　　　　　　
Y. Ikemoto; T. Nakano; Y. Nozue; O. Terasaki; T. Kodaira; T. Yamamoto; Y. Kiyozumi; S. Qiu
Trans. Mat. Res. Soc. Jpn., 1996年, ［査読有り］

Electronic Properties and Structure of Clusters in Zeolite Crystals　　　　　　　　　　　　　　　
Y. Nozue; Y. Ikemoto; T. Nakano; O. Terasaki; T. Kodaira; H. Takeo
Trans. Mat. Res. Soc. Jpn., 1996年, ［査読有り］

CrNb₃S₆のカイラルソリトン格子相におけるスパイク状ESRシグナルの観測
澤田祐也; 吉澤大智; 高阪勇輔; 高阪勇輔; 秋光純; 秋光純; 岸根順一郎; 岸根順一郎; 戸川欣彦; 戸川欣彦; 美藤正樹; 美藤正樹; 井上克也; 井上克也; 中野岳仁; 野末泰夫; 萩原政幸; 萩原政幸
日本物理学会講演概要集(CD-ROM), 2018年03月23日

CrNb₃S₆におけるキラルソリトンの液相‐気相クロスオーバー
吉澤大智; 高阪勇輔; 高阪勇輔; 岸根順一郎; 岸根順一郎; 戸川欣彦; 戸川欣彦; 美藤正樹; 美藤正樹; 井上克也; 井上克也; 秋光純; 秋光純; 中野岳仁; 野末泰夫; 萩原政幸; 萩原政幸
日本物理学会講演概要集(CD-ROM), 2017年03月21日

多層ディラック電子系磁性体EuMnBi₂のゼーベック・ネルンスト効果における量子振動現象
鶴田圭吾; 酒井英明; 酒井英明; 増田英俊; 石渡晋太郎; 石渡晋太郎; 中野岳仁; 野末泰夫; 三宅厚志; 徳永将史; 村川寛; 花咲徳亮
日本物理学会講演概要集(CD-ROM), 2016年09月23日

ゼオライトA中のカリウムクラスターの中性子磁気回折
中野岳仁; 梅本尚嗣; NEMKOVSKIY Kirill; SU Yixi; MANUEL Pascal; KHALYAVIN Dmitry; 大石一城; 松浦直人; 神山崇; 野末泰夫
日本物理学会講演概要集(CD-ROM), 2016年03月22日

22pBE-5 Probing the Superconducting Ground State Organic Superconductor λ-(BETS)_2GaCl_4 by μSR
Sari D. P.; Asih R.; Hiraki K.; Ishii Y.; Kumagai H.; Kawamoto A.; Takahashi T.; Watanabe I.; Nakano T.; Nozue Y.
日本物理学会講演概要集, 2016年

21aCC-9 S=1/2擬二次元カイラル反強磁性体A(TiO)Cu_4(PO_4)_4(A=Ba, Sr)の磁性と誘電性
世良 正一; 野末 泰夫; 木村 剛; 木村 健太; 赤木 暢; 萩原 政幸; 三宅 厚志; 徳永 将史; 松尾 晶; 金道 浩一; 中野 岳仁
日本物理学会講演概要集, 2016年

ゼオライトLSX中のNa‐K合金クラスターが示すフェリ磁性のHeによる圧力効果 III
岸本亮三; 中野岳仁; HETTIARACHCHI Gayan; Prasad; 石井康之; 渡邊功雄; 野末泰夫
日本物理学会講演概要集(CD-ROM), 2015年09月24日

19pCM-3 新規S=1/2 擬二次元カイラル反強磁性体の磁性と誘電性
世良 正一; 木村 健太; 赤木 暢; 萩原 政幸; 中野 岳仁; 野末 泰夫; 木村 剛
日本物理学会講演概要集, 2015年

26aKQ-3 Ba_3CuSb_2O_9の強磁場多周波ESR(銅酸化物1,領域8(強相関系分野:高温超伝導,強相関f電子系など))
荻原 政幸; 韓 一波; 木村 健太; 久我 健太郎; 中辻 知; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 2013年08月26日

ソーダライト中のアルカリ金属ナノクラスターの反強磁性秩序―中性子回折,μSR,放射光メスバウアー分光による研究―
中野岳仁; 花澤宏文; 松浦直人; 廣田和馬; 末廣龍一; 渡邊功雄; AMATO Alex; PRATT Francis L; 福田直起; 瀬戸誠; 小林康浩; 依田芳卓; 野末泰夫
物構研サイエンスフェスタ要旨集, 2013年

ソーダライト中のカリウムクラスターの⁴⁰K放射光メスバウアー吸収分光 II
中野岳仁; 福田直起; 瀬戸誠; 小林康浩; 依田芳卓; 石神直大; 小倉昌子; 三原基嗣; 野末泰夫
日本物理学会講演概要集, 2012年08月24日

ソーダライト中のカリウムクラスターの⁴⁰K放射光メスバウアー吸収分光
中野岳仁; 福田直起; 瀬戸誠; 小林康浩; 依田芳卓; 石神直大; 三原基嗣; 野末泰夫
日本物理学会講演概要集, 2012年03月05日

オリビン型Mn₂GeO₄における電気磁気特性の元素置換からのアプローチ
本田孝志; 木村健太; 石黒友貴; 中村浩之; 若林裕助; 中野岳仁; 野末泰夫; 木村剛
日本物理学会講演概要集, 2011年08月24日

オリビン型マンガン酸化物Mn₂GeO₄の電気磁気特性および置換効果
本田孝志; 木村健太; 石黒友貴; 中村浩之; 若林裕助; 中野岳仁; 野末泰夫; 木村剛
日本物理学会講演概要集, 2011年03月03日

23aGB-11 Ba_3CuSb_2O_9のESR(23aGB パイロクロア・フラストレート系,領域8(強相関系:高温超伝導,強相関f電子系など))
萩原 政幸; 石井 梨恵子; 久我 健太郎; 木村 健太; 中辻 知; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 2011年

25pTJ-4 ゼオライトLSXへのカリウムの圧入と結晶構造変化(25pTJ ゼオライト・DNA,領域7(分子性固体・有機導体))
中野 岳仁; 下堂 康太; 加賀山 朋子; 野末 泰夫
日本物理学会講演概要集, 2011年

22aTD-5 ゼオライトAへのカリウム圧入による構造と電子状態の変化(22aTD ゼオライト系,領域7(分子性固体・有機導体))
中野 岳仁; 下堂 康太; 田中 邦明; 加賀山 朋子; 野末 泰夫
日本物理学会講演概要集, 2011年

23aRL-6 カリウムを吸蔵させたゼオライトAの電気伝導度特性(23aRL ゼオライト,領域7(分子性固体・有機導体))
久保 洋輔; Nam Nguyen Hoang; 高見 剛; 荒木 新吾; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 2010年08月18日

23aRL-7 アルカリ金属を吸蔵したLSX型ゼオライトにおける^<23>Na-NMRスペクトルのシフト特性(23aRL ゼオライト,領域7(分子性固体・有機導体))
五十嵐 睦夫; 中野 岳仁; 後藤 敦; 端 健二郎; 清水 禎
日本物理学会講演概要集, 2010年08月18日

24pWJ-4 A型反強磁性を示す希土類金属Mn酸化物の動的誘電特性(24pWJ Mn酸化物2(マルチフェロイクス・超格子),領域8(強相関系:高温超伝導,強相関f電子系など))
井山 彩人; Jung JongSuck; 山口 泰弘; 中野 岳仁; 野末 泰夫; 中村 浩之; 若林 裕助; 木村 剛
日本物理学会講演概要集, 2010年08月18日

23aWP-8 (Ni,Mn)TiO_3におけるスピングラス転移と電気磁気効果(23aWP フラストレーション系(新物質,スピングラス,その他),領域3(磁性,磁気共鳴))
山口 泰弘; 中村 浩之; 中野 岳仁; 野末 泰夫; 木村 剛
日本物理学会講演概要集, 2010年08月18日

22pGR-5 Naを飽和吸蔵したゼオライトLSXのNMR特性(22pGR ゼオライト・クラスレート,領域7(分子性固体・有機導体))
五十嵐 睦夫; 中野 岳仁; 後藤 敦; 端 健二郎; 清水 禎; 水金 貴裕; ティ ファム・タン; 野末 泰夫
日本物理学会講演概要集, 2010年03月01日

22pGR-2 中性子回折で見たソーダライト中のNaクラスターの反強磁性秩序(22pGR ゼオライト・クラスレート,領域7(分子性固体・有機導体))
中野 岳仁; 花澤 宏文; 松浦 直人; 加賀山 朋子; 廣田 和馬; 野末 泰夫
日本物理学会講演概要集, 2010年03月01日

22pGR-3 ゼオライトA中のKクラスターの圧力ドーピングによる構造変化(22pGR ゼオライト・クラスレート,領域7(分子性固体・有機導体))
田中 邦明; 下堂 康太; 中野 岳仁; 加賀山 朋子; 野末 泰夫
日本物理学会講演概要集, 2010年03月01日

28aYG-2 アルカリ金属を吸着したソダライトのNMR(II)(28aYG ゼオライト,領域7(分子性固体・有機導体))
五十嵐 睦夫; 中野 岳仁; 後藤 敦; 端 健二郎; 清水 禎; 野末 泰夫
日本物理学会講演概要集, 2009年03月03日

24pRB-6 K_n/NaK-FAU(1)における^<27>Al-NMR特性の吸着濃度変化(ゼオライト,領域7,分子性固体・有機導体)
五十嵐 睦夫; 中野 岳仁; 後藤 敦; 端健 二郎; 清水 禎; 山道 桂子; 野末 泰夫
日本物理学会講演概要集, 2007年08月21日

21pRG-6 K_n/NaK-FAU(1)の高濃度領域におけるNMR特性(ゼオライト,領域7,分子性固体・有機導体)
五十嵐 睦夫; 中野 岳仁; 後藤 敦; 端 健二郎; 清水 禎; 山道 桂子; 野末 泰夫
日本物理学会講演概要集, 2007年02月28日

30aRC-12 K_n/K-FAU(1)の^<27>Al-NMR特性(30aRC クラスター・ゼオライト,領域7(分子性固体・有機導体))
五十嵐 睦夫; 鑓水 将志; 山道 桂子; 後藤 敦; 端 健二郎; 清水 禎; 中野 岳仁; 後藤 健; 野末 泰夫
日本物理学会講演概要集, 2006年03月04日

25pYN-8 ゼオライトMORの赤外顕微分光(ゼオライト類,領域7(分子性固体・有機導体))
池本 夕佳; 森脇 太郎; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 2005年

27pWN-2 ゼオライト中のNa内殻の軟X線吸収分光(ゼオライト・高圧物性)(領域7)
中野 岳仁; 辛 埴; 野末 泰夫; 秦野 晴行; 木庭 大輔; 池本 夕佳; 小平 哲也; 池田 卓史; 原田 慈久; 福島 昭子; 小林 啓介
日本物理学会講演概要集, 2004年

18aTE-7 強磁性モット絶縁体Lu_2V_2O_7単結晶の物性
社本 真一; 中野 岳仁; 竹田 智; 狩野 瑠奈; 秋光 純; 小野 泰弘; 野末 泰夫; 梶谷 剛
日本物理学会講演概要集, 2001年09月03日

24pSD-4 強磁性モット絶縁体Lu_2V_2O_7の軌道
社本 真一; 田澤 洋志; 中野 岳仁; 小野 泰弘; 野末 泰夫; 梶谷 剛
日本物理学会講演概要集, 2000年09月10日

27pF-3 ゼオライトFAU(Xタイプ)中のNa及びKクラスター電子状態の違いについて
池本 夕佳; 久野 桃子; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 1999年09月03日

27aF-10 ゼオライトLTA中のRbクラスターのESR : スペクトル幅の異常な増大
中野 岳仁; 池本 夕佳; 野末 泰夫
日本物理学会講演概要集, 1999年09月03日

27pF-2 ゼオライトFAU(X及びYタイプ)中のNaクラスターの光学スペクトルとESRスペクトル
久野 桃子; 池本 夕佳; 中野 岳仁; 野末 泰夫
日本物理学会講演概要集, 1999年09月03日

26p-YF-3 Lu_2V_2O_7の電気伝導とEPR
田澤 洋志; 社本 真一; 小野 泰弘; 野末 泰夫; 中野 岳仁; 梶谷 剛
日本物理学会講演概要集, 1998年09月05日

Na吸蔵ゼオライトLSXにおける絶縁体金属転移とミュオニウム形成　　　　　　　　　　　　　　　
平石雅俊; 宇津野魁杜; 石原未瑳樹; 武井智紀; 大石一城; 小嶋健児; 中野岳仁
日本物理学会2025年春季大会, 2025年03月20日
20250318, 20250321

ナトリウム金属の正および負ミュオンスピン回転/緩和　　　　　　　　　　　　　　　
武井智紀; 中野岳仁; 梅垣いづみ; 大石一城; 二宮和彦; Amba Datt Pant; 竹下聡史; 杉山純
日本物理学会2025年春季大会, 2025年03月20日
20250318, 20250321

アルカリ超酸化物混晶Rb1-xCsxO2の構造相転移と磁性
真鍋幸生; 塩見透慎; 堀金和正; 中野岳仁; Harald O. Jeschke; 大槻純也; 神戸高志
2024年度量子ビームサイエンスフェスタ, 2025年03月13日, 高エネルギー加速器研究機構 物質構造科学研究所、J-PARC センター、 総合科学研究機構（CROSS）、PF ユーザーアソシエイション（PF-UA）、 J-PARC MLF利用者懇談会
20250312, 20250314

ナトリウム金属の正および負ミュオンスピン回転/緩和
武井智紀; 中野岳仁; 梅垣いづみ; 大石一城; 二宮和彦; Amba Datt Pan; 竹下聡史; 杉山純
2024年度量子ビームサイエンスフェスタ, 2025年03月13日, 高エネルギー加速器研究機構 物質構造科学研究所、J-PARC センター、 総合科学研究機構（CROSS）、PF ユーザーアソシエイション（PF-UA）、 J-PARC MLF利用者懇談会
20250312, 20250314

放射光メスバウアー分光で見るソーダライト中のカリウムナノ粒子の磁性
中野岳仁
第6回SPring-8放射光利用技術研究会「SPring-8-Ⅱに向けたユーザー利用環境高度化の最新情報および核共鳴散乱」, 2024年11月06日, SPring-8利用推進協議会（推進協）、公益財団法人高輝度光科学研究センター（JASRI）、SPRUC企業利用研究会, ［招待有り］
20241106, 20241106

Exploration of new materials by high-pressure synthesis using alkali metal-doped fullerenes
M. Watanabe; A. Ohashi; H. Baba; S. Sato; S. Nomiya; M. Hiraishi; S. Kakizawa; N. Tsujino; Y. Higo; T. Nakano
The 9th International Symposium of Quantum Beam Science at Ibaraki University (ISQBS2024), 2024年10月19日
20241019, 20241022

μ±SR study on sodium metal
T. Takei; T. Nakano; I. Umegaki; K. Ohishi; K. Ninomiya; A. D. Pan; S. Takeshita; J. Sugiyama
The 9th International Symposium of Quantum Beam Science at Ibaraki University (ISQBS2024), 2024年10月19日
20241019, 20241022

μ±SR study on sodium metal　　　　　　　　　　　　　　　
T. Takei; T. Nakano; I. Umegaki; K. Ohishi; K. Ninomiya; A. D. Pan; S. Takeshita; J. Sugiyama
The 4th J-PARC Symposium 2024, 2024年10月15日
20241014, 20241018

アルカリ超酸化物混晶Rb1-xCsxO2の結晶構造と磁性　　　　　　　　　　　　　　　
真鍋幸生; 塩見透慎; 堀金和正; 中野岳仁; 神戸高志
日本物理学会第79回年次大会, 2024年09月18日
20240916, 20240919

アルカリ金属ドープフラーレンの高圧高温処理による新物質探索
大橋歩夢; 渡部誠; 馬場洋行; 佐藤蒼汰; 野宮慎平; 平石雅俊; 肥後祐司; 中野岳仁
日本物理学会第79回年次大会, 2024年09月17日
20240916, 20240919

ミュオン周波数シフトで見るNa吸蔵ゼオライトLSXの絶縁体金属転移　　　　　　　　　　　　　　　
宇津野魁杜; 平石雅俊; 武井智紀; 石原未瑳樹; 大石一城; 小嶋健児; 中野岳仁
日本中間子科学会研究会 第2回中間子科学の将来討論会, 2024年07月25日, 日本中間子科学会, ［招待有り］
20240724, 20240725

アルカリ超酸化物混晶Rb1-xCsxO2の構造と磁性　　　　　　　　　　　　　　　
真鍋幸生,中野岳仁,神戸高志
日本物理学会2024年春季大会, 2024年03月18日, 日本物理学会
20240318, 20240321

ミュオン周波数シフト測定によるNa吸蔵ゼオライトLSXの研究II　　　　　　　　　　　　　　　
平石雅俊,宇津野魁杜,石原未瑳樹,武井智紀,大石一城,小嶋健児,中野岳仁
日本物理学会2024年春季大会, 2024年03月18日, 日本物理学会
20240318, 20240321

ミュオン周波数シフト測定によるNa吸蔵ゼオライトLSXの研究II
宇津野魁杜,平石雅俊,武井智紀,石原未瑳樹,大石一城,小嶋健児,中野 岳仁
2023年度量子ビームサイエンスフェスタ, 2024年03月06日, 高エネルギー加速器研究機構 物質構造科学研究所、J-PARC センター、 総合科学研究機構（CROSS）、PF ユーザーアソシエイション（PF-UA）、 J-PARC MLF利用者懇談会
20240305, 20240307

Muon Knight shift study on the insulating and metallic states in Na-loaded zeolite low-silica X
M. Hiraishi; K. Utsuno; M. Ishihara; K. Ohishi; K. M. Kojima; T. Nakano
MRM2023, 2023年12月14日, Materials Research Society of Japan (MRS-J)
20231211, 20231216

Search for Carbon-based New Three-dimensional Network Materials by High-pressure Synthesis
A. Ohashi; H. Baba; M. Watanabe; S. Sato; S. Nomiya; Y. Higo; T. Nakano
8th International Symposium of Quantum Beam Science at Ibaraki University (ISQBS2023), 2023年11月29日, Institute of Quantum Beam Science, Ibaraki University
20231128, 20231130

Muon Frequency Shift Study of the Insulator-Metal Transition of Na-Loaded Zeolite Low-Silica X
K. Utsuno; M. Hiraishi; T. Takei; M. Ishihara; K. Ohishi; K. M. Kojima; T. Nakano
8th International Symposium of Quantum Beam Science at Ibaraki University (ISQBS2023), 2023年11月29日, Institute of Quantum Beam Science, Ibaraki University
20231128, 20231130

Magnetic Structure of Quasi-one-dimensional p-Electron Antiferromagnet CsO2
S. Kontani; T. Nakano; M. Hiraishi; K. Mita; M. Miyajima; T. Kambe
8th International Symposium of Quantum Beam Science at Ibaraki University (ISQBS2023), 2023年11月29日, Institute of Quantum Beam Science, Ibaraki University
20231128, 20231130

Hyperfine coupling between Na and magnetic moment of Na-K alloy clusters in zeolite low-silica X
M.Igarashi; T. Shimizu; A. Goto; K. Hashi; K. Yamamichi; T. Nakano
International Conference on Hyperfine Interactions and their Applications (HYPERFINE2023), 2023年11月16日
20231113, 20231117

Muon Knight shift study on the insulating and metallic states in Na-loaded zeolite low-silica X
M. Hiraishi; K. Utsuno; M. Ishihara; K. Ohishi; K.M. Kojima; T. Nakano
International Conference on Hyperfine Interactions and their Applications (HYPERFINE2023), 2023年11月14日
20231113, 20231117

��+SR study on ferromagnetism of Na-K alloy clusters in zeolite low-silica X
Luu Manh Kien; Isao Watanabe; Takehito Nakano
International Conference on Hyperfine Interactions and their Applications (HYPERFINE2023), 2023年11月14日
20231113, 20231117

Magnetic properties of Ca-containing zeolite low-silica X loaded with K atoms
Shuhei Harashima; Takehito Nakano
International Conference on Hyperfine Interactions and their Applications (HYPERFINE2023), 2023年11月14日
20231113, 20231117

Magnetic structure of quasi-one-dimensional p-electron antiferromagnet CsO2
Takehito Nakano; Shun Kontani; Masatoshi Hiraishi; Kaito Mita; Mizuki Miyajima; Takashi Kambe
International Conference on Hyperfine Interactions and their Applications (HYPERFINE2023), 2023年11月14日
20231113, 20231117

Neutron diffraction studies on s- and p-electron magnets
Takehito Nakano
The 4th International Workshop on Advanced Materials and Devices 2023 (IWAMD 2023), 2023年08月12日, ［招待有り］
20230810, 20230813

Growing density of states at the Fermi level across the insulator-to-metal transition of LSX zeolite with heavily-loaded Na
T. Nakano; K. Mukai; P. Jeglic; T. Meznarsic; D. Arcon; M. Igarashi
21th International Symposium on Intercalation Compounds, 2023年06月13日
20230611, 20230615

ミュオン周波数シフト測定によるNa 吸蔵ゼオライトLSXの研究　　　　　　　　　　　　　　　
平石雅俊; 宇津野魁杜; 石原未瑳樹; 中野岳仁; 大石一城; 小嶋健児
日本物理学会2023年春季大会, 2023年03月24日, 日本物理学会
20230322, 20230325

茨城大学によるJRR-3 HQR を含む量子ビーム利用による研究・教育活動
岩佐和晃; 大山研司; 横山淳; 中野岳仁; 桑原慶太郎; 伊賀文俊; 中島多朗
2022年度量子ビームサイエンスフェスタ, 2023年03月15日, 高エネルギー加速器研究機構 物質構造科学研究所、J-PARC センター、 総合科学研究機構（CROSS）、PF ユーザーアソシエイション（PF-UA）、 J-PARC MLF利用者懇談会
20230313, 20230315

ミュオン周波数シフト測定によるNa 吸蔵ゼオライトLSXの研究
平石雅俊; 宇津野魁杜; 石原未瑳樹; 中野岳仁; 大石一城; 小嶋健児
2022年度量子ビームサイエンスフェスタ, 2023年03月15日, 高エネルギー加速器研究機構 物質構造科学研究所、J-PARC センター、 総合科学研究機構（CROSS）、PF ユーザーアソシエイション（PF-UA）、 J-PARC MLF利用者懇談会
20230313, 20230315

負ミュオンスピン緩和で視るLi含有層状酸化物のダイナミクス　　　　　　　　　　　　　　　
杉山純; 大石一城; 梅垣いづみ; 竹下聡史; 幸田章宏; 中野岳仁; 山内一宏; 二宮和彦; 久保謙哉
日本物理学会2022年秋季大会, 2022年09月14日, 日本物理学会
20220910, 20220915

アルカリ金属超酸化物CsO2の中性子磁気回折　　　　　　　　　　　　　　　
紺谷駿,中野岳仁,岡田健吾,原島周平,大山研司,三田魁人,宮島瑞樹,神戸高志
日本物理学会2022年秋季大会, 2022年09月12日, 日本物理学会
20220910, 20220915

Mott-insulating state of alkali-metal clusters in sodalite studied by μSR
T. Nakano; H. Baba; K. Ohishi; Y. Cai; S. Yoon; K. M. Kojima
15th International Conference on Muon Spin Rotation, Relaxation and Resonance, 2022年09月01日
20220828, 20220902

Negative muon spin rotation and relaxation for energy materials
J. Sugiyama; K. Ohishi; Y. Sassa; T. Nakano; M. K. Kubo; S. Takeshita; K. Shimomura; E. Nocerino; O. K. Forslund; N. Matsubara; M. Mansson; K. Ninomiya; K. Ishida; A. Hillier; I. Umegaki
15th International Conference on Muon Spin Rotation, Relaxation and Resonance, 2022年08月30日
20220828, 20220902

Negative muon spin rotation and relaxation study on Li metal
J. Sugiyama; K. Shimomura; S. Takeshita; T. Nakano; M. K. Kubo; K. Ninomiya; I. Umegaki
15th International Conference on Muon Spin Rotation, Relaxation and Resonance, 2022年08月30日
20220828, 20220902

Negative muon spin rotation and relaxation study on antiferromagnetic order of Na clusters in sodalite
T. Nakano; H. Baba; S. Takeshita; J. Sugiyama
15th International Conference on Muon Spin Rotation, Relaxation and Resonance, 2022年08月30日
20220828, 20220902

アルカリ金属超酸化物CsO2の中性子回折　　　　　　　　　　　　　　　
中野岳仁,紺谷駿,岡田健吾,原島周平,大山研司,三田魁人,宮島瑞樹,神戸高志
日本物理学会第77回年次大会, 2022年03月17日, 日本物理学会
20220315, 20220319

Correlated electron systems in the regular nanospace of zeolite crystals　　　　　　　　　　　　　　　
中野岳仁
Muon合同研究会, 2022年01月07日, 日本中間子科学会, ［招待有り］
20220106, 20220108

Positive and negative muons spin rotation/relaxation studies on,Mott-insulating state of alkali-metal clusters in sodalite
Takehito Nakano; Hiroyuki Baba; Kazuki Ohishi; Yipeng Cai; Sungwon Yoon; Kenji M. Kojima; Soshi Takeshita; Jun Sugiyama
MATERIALS RESEARCH MEETING 2021, 2021年12月15日, MRS-J
20211213, 20211216

Antiferromagnetic Mott Insulating State of Alkali-Metal Nanoclusters in Sodalite Studied by Muons and DFT Calculations　　　　　　　　　　　　　　　
Takehito Nakano
International Conference on Materials Science,and Engineering 2021 (Materials Oceania), 2021年10月14日, ［招待有り］
20211011, 20211014

負ミュオンスピン回転緩和法によるソーダライト中のNaクラスターの反強磁性秩序の観測　　　　　　　　　　　　　　　
中野岳仁,馬場洋行,竹下聡史,杉山純
日本物理学会2021年秋季大会, 2021年09月23日, 日本物理学会
20210920, 20210923

ソーダライト中のアルカリ金属クラスターのミュオンナイトシフト　　　　　　　　　　　　　　　
中野 岳仁; 馬場 洋行; 大石 一城; Yipeng Cai; Sungwon Yoon; 小嶋 健児
日本物理学会第76回年次大会, 2021年03月14日, 日本物理学会
20210312, 20210315

磁気探針としての放射光・中性子・ミュオンの連携利用研究 –ソーダライト中のアルカリ金属ナノクラスターの反強磁性秩序とモット転移–
中野岳仁
MRM Forum 2020, 2020年12月08日, 日本MRM
20201207, 20201209

Complementary Use of Muons, Neutrons and Synchrotron Radiation –Study of Magnetism in Arrayed Alkali-Metal Nanoclusters–
Takehito Nakano
The 5th International Symposium of Quantum Beam Science at Ibaraki University, 2020年11月21日, ［招待有り］

Electron Spin Resonance Study on Rb Nanoclustes in Zeolite A
Akihiro Hayashi; Takehito Nakano
The 5th International Symposium of Quantum Beam Science at Ibaraki University, 2020年11月20日

Muon Knight shift study on alkali-metal clusters in sodalite
Hiroyuki Baba; Takehito Nakano; Kazuki Ohishi; Yipeng Cai; Sungwon Yoon; Kenji M. Kojima
The 5th International Symposium of Quantum Beam Science at Ibaraki University, 2020年11月19日

Gap opening on the ferrimagnetic state in Na-K alloy nanoclusters arrayed in zeolite LSX – Can s-electrons be a strongly correlated system? –　　　　　　　　　　　　　　　
Takehito Nakano
International Conference on Functional Materials Sciences 2020, 2020年11月12日, ［招待有り］

ソーダライト中のアルカリ金属ナノクラスターのミュオンナイトシフト　　　　　　　　　　　　　　　
中野 岳仁,馬場 洋行,大石 一城,Yipeng Cai,Sungwon Yoon,小嶋 健児
日本中性子科学会年会, 2020年11月10日, 日本中性子科学会

Strong Enhancement of Spin-orbit Interaction in Alkali Metal Nanoclusters Incorporated into Zeolite A　　　　　　　　　　　　　　　
Takehito Nakano; Yasuo Nozue
Materials Research Meeting 2019, 2019年12月13日

Direct Observation of Ferromagnetic Moment of Potassium Nanoclusters Arrayed in Zeolite A by Polarized Neutron Diffraction　　　　　　　　　　　　　　　
Takehito Nakano; Kazuki Ohishi; Masato Matsuura
Materials Research Meeting 2019, 2019年12月12日

Strong Enhancement of Spin-orbit Interaction and Ferromagnetism in Potassium Nanoclusters Incorporated into Zeolite A　　　　　　　　　　　　　　　
Takehito Nakano
1st International Conference on Magnetism and Its Applications, 2019年11月20日, ［招待有り］

ゼオライトLSX中のNa-Kクラスターが示すフェリ磁性の高圧Heガス下におけるμSR　　　　　　　　　　　　　　　
中野岳仁,Luu Manh Kien,渡邊功雄,Retno Asih,石井康之,Mark Kibble,Christopher Goodway,Colin Offer,Robert Done
日本物理学会第74回年次大会, 2019年03月14日

偏極中性子回折で見るゼオライトＡ中のカリウムクラスターの強磁性
中野岳仁,大石一城,松浦直人
2018年度量子ビームサイエンスフェスタ, 2019年03月12日

Polarized Neutron Diffraction Study on Ferromagnetism of Potassium Nanoclusters Incorporated into Zeolite A
Takehito Nakano; Kazuki Ohishi; Masato Matsuura
4th International Conference on Functional Materials Science 2018 (ICFMS 2018), 2018年11月15日, ［招待有り］

Correlated s-Electron Systems in Regular Nanospace of Zeolite Crystals　　　　　　　　　　　　　　　
Takehito Nakano
12th PRAGUE COLLOQUIUM ON f-ELECTRON SYSTEMS, 2018年07月04日, ［招待有り］

Magnetic Ordering of s-Electrons Confined in Regular Nanospace of Zeolite Studied by using Muon, Neutron and Synchrotron Radiation Light　　　　　　　　　　　　　　　
Takehito Nakano
3rd International Symposium of Quantum Beam Science at Ibaraki University, 2018年05月31日

偏極中性子回折で見るゼオライトA中のKクラスターの強磁性　　　　　　　　　　　　　　　
中野岳仁,大石一城,松浦直人
日本物理学会 第７３回年次大会, 2018年03月25日

ゼオライトA 中のRb クラスターにおける巨大なスピン軌道相互作用　　　　　　　　　　　　　　　
中野岳仁,鈴木将太,Truong Cong Duan,野末泰夫
日本物理学会 2017年秋季大会, 2017年09月21日

Correlated electrons of alkali metals in regular nanospace of zeolite crystals　　　　　　　　　　　　　　　
Takehito Nakano
International Workshop on Organic Molecular Systems, 2017年08月02日

Extraordinary enhancement of ferromagnetic properties in Na-K alloy clusters in zeolite LSX driven by high pressure helium gas　　　　　　　　　　　　　　　
Takehito Nakano; Ryozo Kishimoto, Gayan; Prasad Hettiarachchi; Yasuyuki Ishii; Retno Asih; Luu Manh Kien; Colin Offer; Isao Watanabe; Yasuo Nozue
International Conference on Muon Spin Rotation, Relaxation and Resonance (μSR2017), 2017年06月29日

Anomalous enhancement of ferromagnetic properties in Na-K alloy nanoclusters incorporated into zeolite LSX driven by high pressure helium gas　　　　　　　　　　　　　　　
Takehito Nakano; Ryozo Kishimoto, Gayan; Prasad Hettiarachchi; Yasuyuki Ishii; Isao Watanabe; Yasuo Nozue
International Symposium on Intercalation Compounds (ISIC19), 2017年05月30日

ゼオライトA中のカリウムクラスターの中性子磁気回折II
中野 岳仁; 大石 一城; 松浦 直人; Nemkovskiy Kirill; Su Yixi; Manuel Pascal; Khalyavin Dmitry; 梅本 尚嗣; 野末 泰夫
日本物理学会 第７２回年次大会, 2017年03月19日

Anomalous enhancement of ferromagnetic properties in alkali-metal nanoclusters in zeolite crystal by high pressure helium gas　　　　　　　　　　　　　　　
Takehito Nakano
3rd International Conference on Functional Materials Science 2016 (ICFMS2016), 2016年10月19日, ［招待有り］

Antiferromagnetic ordering and insulator-to-metal transition in alkali metal nanoclusters arrayed in sodalite　　　　　　　　　　　　　　　
Takehito Nakano
European Physical Society, Condensed Matter Division (CMD-26), 2016年09月04日

19aAS-1 ゼオライトA中のカリウムクラスターの中性子磁気回折
中野 岳仁; 野末 泰夫; 梅本 尚嗣; Nemkovskiy Kirill; Su Yixi; Manuel Pascal; Khalyavin Dmitry; 大石 一城; 松浦 直人; 神山 崇
日本物理学会, 2016年, 一般社団法人 日本物理学会

18aAF-2 ゼオライトLSX中のNa-K合金クラスターが示すフェリ磁性のHeによる圧力効果III
岸本 亮三; 中野 岳仁; Hettiarachchi Gayan Prasad; 石井 康之; 渡邊 功雄; 野末 泰夫
日本物理学会, 2015年, 一般社団法人 日本物理学会

18aAF-1 ソーダライト中のアルカリ金属クラスターにおけるモット絶縁体-バイポーラロン絶縁体転移
中野 岳仁; 渡邊 邦博; 阪本 康弘; 野末 泰夫
日本物理学会, 2015年, 一般社団法人 日本物理学会

24pAC-5 ソーダライト中のK-Rb合金およびRbクラスターのμSR
中野 岳仁; 谷辺 健志; Kien Luu Manh; Yoon Sungwon; Abdel-Jawad Majed; Pratt Francis L.; 渡邊 功雄; 野末 泰夫
日本物理学会, 2015年, 一般社団法人 日本物理学会

9aAL-3 ゼオライトLSX中のNa-K合金クラスターが示すフェリ磁性のHeによる圧力効果II(9aAL 籠状物質・ネットワーク物質,領域7(分子性固体))
中野 岳仁; Hettiarachchi Gayan Prasad; 岸本 亮三; 石井 康之; 渡邊 功雄; 野末 泰夫
日本物理学会, 2014年, 一般社団法人 日本物理学会

27pAN-2 ゼオライトLSX中のNa-K合金クラスターが示すフェリ磁性のHeによる圧力効果(27pAN 籠状物質・ネットワーク物質,領域7(分子性固体))
中野 岳仁; Hettiarachchi Gayan Prasad; 石井 康之; 渡邊 功雄; 野末 泰夫
日本物理学会, 2014年, 一般社団法人 日本物理学会

9aAL-4 Naを吸蔵したゼオライトLSXの絶縁体金属転移とスピン磁化率(9aAL 籠状物質・ネットワーク物質,領域7(分子性固体))
中野 岳仁; 林 俊平; 角野 宏和; 野末 泰夫
日本物理学会, 2014年, 一般社団法人 日本物理学会

27pDF-2 ソーダライト中のKおよびK-Rb合金クラスターの反強磁性共鳴(籠状物質・ネットワーク物質,領域7(分子性個体・有機導体))
中野 岳仁; 告野 元; 花澤 宏文; 柏木 隆成; 野末 泰夫; 萩原 政幸
日本物理学会, 2013年, 一般社団法人 日本物理学会

27pDF-1 ソーダライト中のKクラスターの中性子磁気回折(籠状物質・ネットワーク物質,領域7(分子性個体・有機導体))
中野 岳仁; 松浦 直人; 花澤 宏文; 廣田 和馬; 野末 泰夫
日本物理学会, 2013年, 一般社団法人 日本物理学会

26aXF-1 Rbを吸蔵したソーダライトの構造と物性(26aXF ゼオライト,領域7(分子性固体・有機導体))
中野 岳仁; 石田 裕子; 池田 卓史; 野末 泰夫
日本物理学会, 2013年, 一般社団法人 日本物理学会

18pEC-1 ソーダライト中のカリウムクラスターの^<40>K放射光メスバウアー吸収分光II(18pEC 籠状物質・ネットワーク物質,領域7(分子性固体・有機導体))
中野 岳仁; 福田 直起; 瀬戸 誠; 小林 康浩; 依田 芳卓; 石神 直大; 小倉 昌子; 三原 基嗣; 野末 泰夫
日本物理学会, 2012年, 一般社団法人 日本物理学会

24aCJ-8 ソーダライト中のカリウムクラスターの^<40>K放射光メスバウアー吸収分光(24aCJ 籠状物質,領域7(分子性固体・有機導体))
中野 岳仁; 福田 直起; 瀬戸 誠; 小林 康浩; 依田 芳卓; 石神 直大; 三原 基嗣; 野末 泰夫
日本物理学会, 2012年, 一般社団法人 日本物理学会

22aTD-5 ゼオライトAへのカリウム圧入による構造と電子状態の変化(22aTD ゼオライト系,領域7(分子性固体・有機導体))
中野 岳仁; 下堂 康太; 田中 邦明; 加賀山 朋子; 野末 泰夫
日本物理学会, 2011年, 一般社団法人 日本物理学会

25pTJ-4 ゼオライトLSXへのカリウムの圧入と結晶構造変化(25pTJ ゼオライト・DNA,領域7(分子性固体・有機導体))
中野 岳仁; 下堂 康太; 加賀山 朋子; 野末 泰夫
日本物理学会, 2011年, 一般社団法人 日本物理学会

22pGR-2 中性子回折で見たソーダライト中のNaクラスターの反強磁性秩序(22pGR ゼオライト・クラスレート,領域7(分子性固体・有機導体))
中野 岳仁; 花澤 宏文; 松浦 直人; 加賀山 朋子; 廣田 和馬; 野末 泰夫
日本物理学会, 2010年, 一般社団法人 日本物理学会

23aRL-5 ソーダライト中のK-Rb合金クラスターの反強磁性転移(23aRL ゼオライト,領域7(分子性固体・有機導体))
中野 岳仁; 石田 裕子; 花澤 宏文; 野末 泰夫
日本物理学会, 2010年, 一般社団法人 日本物理学会

28aYG-1 μSRで見たソーダライト中のアルカリ金属クラスターの反強磁性秩序(28aYG ゼオライト,領域7(分子性固体・有機導体))
中野 岳仁; 末廣 龍一; 花澤 宏文; 渡邊 功雄; 鈴木 栄男; 川股 隆行; Amato A.; Pratt F. L.; 野末 泰夫
日本物理学会, 2009年, 一般社団法人 日本物理学会

23aWF-3 ソーダライト中のアルカリ金属クラスターの反強磁性共鳴(23aWF ゼオライト・分子性固体,領域7(分子性固体・有機導体))
中野 岳仁; 花澤 宏文; 柏木 隆成; 萩原 政幸; 野末 泰夫
日本物理学会, 2008年, 一般社団法人 日本物理学会

21pRG-1 ソーダライト中のアルカリ金属クラスターの反強磁性と光学的性質(ゼオライト,領域7,分子性固体・有機導体)
中野 岳仁; 渡邊 邦博; 野末 泰夫
日本物理学会, 2007年, 一般社団法人 日本物理学会

24pRB-5 ソーダライト中のアルカリ金属クラスターの反強磁性と光学的性質II(ゼオライト,領域7,分子性固体・有機導体)
渡邊 邦博; 中野 岳仁; 野末 泰夫
日本物理学会, 2007年, 一般社団法人 日本物理学会

25pYN-5 ゼオライト中でのミュオニウム形成とアルカリ金属吸蔵依存性(ゼオライト類,領域7(分子性固体・有機導体))
中野 岳仁; 後藤 健; 渡邊 功雄; Pratt F.; 野末 泰夫
日本物理学会, 2005年, 一般社団法人 日本物理学会

24pXN-7 ゼオライトLTA中のKクラスターのμSR II(24pXN ナノチューブ,ゼオライト,領域7(分子性固体・有機導体分野))
中野 岳仁; 木庭 大輔; 秦野 晴行; Pratt F. L.; 渡邊 功雄; 池本 夕佳; 野末 泰夫
日本物理学会, 2002年, 一般社団法人 日本物理学会

19aTJ-8 ゼオライトLTA中のKクラスターのμSR
中野 岳仁; Pratt F. L.; 渡邊 功雄; 池本 夕佳; 野末 泰夫
日本物理学会, 2001年, 一般社団法人 日本物理学会

日本中間子科学会

日本物理学会

新しい炭素ネットワーク物質の高圧合成による高温超伝導探索
基盤研究（C）
茨城大学
2022年04月 - 2026年03月

電磁トラップを利用したミュー粒子の質量と磁気モーメントの精密測定と新物理探索
基盤研究（S）
大学共同利用機関法人高エネルギー加速器研究機構
2021年11月 - 2025年03月

ラシュバ効果によるs電子系ナノクラスターのスピン軌道相互作用増強機構
基盤研究(C)
2019年04月 - 2023年03月

新奇炭素系ネットワーク物質の高圧合成による高温超伝導探索
2020年10月 - 2022年03月

中性子散乱によるs 電子強磁性の機構解明（国際共同研究強化）
国際共同研究加速基金（国際共同研究強化）
2016年06月 - 2020年03月

ゼオライトにおけるポーラロン誘起金属絶縁体転移をめぐる局所場ゆらぎ　　　　　　　　　　　　　　　
基盤研究(C)
2016年04月 - 2019年03月

中性子散乱によるs電子強磁性の機構解明
基盤研究(C)
2014年04月 - 2017年03月

ナノ空間におけるアルカリ金属ｓ電子系の絶縁体金属転移と強磁性
基盤研究(A)
2012年04月 - 2017年03月

放射光メスバウアー法によるアルカリ金属ナノクラスター磁性体の研究
ひょうご科学技術協会 奨励研究助成
2012年04月 - 2013年03月

放射光メスバウアー測定によるアルカリ金属ナノクラスター磁性体の研究
大阪大学G-COE「物質の量子機能解明と未来型機能材料創出」萌芽的研究
2011年04月 - 2012年03月

ゼオライトLSX中に配列したアルカリ金属クラスターのフェリ磁性の研究　　　　　　　　　　　　　　　
若手研究(B)
2008年04月 - 2011年03月

ゼオライト系化合物の物質探索　　　　　　　　　　　　　　　
特定領域研究
2007年 - 2011年

配列したナノ空間における電子相関と物性制御　　　　　　　　　　　　　　　
基盤研究(A)
2001年 - 2003年

ゼオライトの細孔に周期配列したアルカリ金属クラスターの光学的・磁気的性質　　　　　　　　　　　　　　　
日本学術振興会: 特別研究員奨励費
2000年04月 - 2001年10月

ミュオンを探針とした物性物理学/材料科学の研究
講師
高エネルギー加速器研究機構，茨城大学, 第１回茨城大学KEK-Day量子線科学講座「量子の目でモノを見る！」, 2022年03月29日 - 2022年03月29日