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BaCo(PO
)Sheng, J.*; Wang, L.*; Candini, A.*; Jiang, W.*; Huang, L.*; Xi, B.*; Zhao, J.*; Ge, H.*; Zhao, N.*; Fu, Y.*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 119(51), p.e2211193119_1 - e2211193119_9, 2022/12
被引用回数：3 パーセンタイル：28(Multidisciplinary Sciences)Although considerable progress has been made in the theoretical understanding of the low-dimensional frustrated quantum magnets, experimental realizations of a well-established scaling analysis are still scarce. This is particularly true for the two-dimensional antiferromagnetic triangular lattices. Owing to the small exchange strength, the newly discovered compound NaBaCo(PO) provides a rare opportunity for clarifying the quantum criticality in an ideal triangular lattice with quantum spin S=1/2. In addition to the establishment of the complete phase diagrams, the spin Hamiltonian with a negligible interplane interaction has been determined through the spin wave dispersion in the polarized state, which is consistent with the observation of a two-dimensional quantum critical point with the Bose-Einstein condensation of diluted free bosons.
; 
SR studies and charge-spin percolation modelSheng, Q.*; 金子 竜也*; Yamakawa, Kohtaro*; Guguchia, Z.*; Gong, Z.*; Zhao, G.*; Dai, G.*; Jin, C.*; Guo, S.*; Fu, L.*; et al.
Physical Review Research (Internet), 4(3), p.033172_1 - 033172_14, 2022/09
A pyrite system NiS
Se
exhibits a bandwidth controlled Mott transition via (S,Se) substitutions in a two-step process: the antiferromagnetic insulator (AFI) to antiferromagnetic metal (AFM) transition at 
0.45 followed by the AFM to paramagnetic metal (PMM) transition at 1.0. Among a few other Mott systems which exhibit similar two-step transitions, Ni(S,Se) is of particular interest because a large intermediate AFM region in the phase diagram would provide unique opportunities to study the interplay between the spin and charge order. By comparing and combining our muon spin relaxation studies and previous neutron scattering studies, here we propose a picture where the spin order is maintained by the percolation of "nonmetallic" localized and dangling Ni moments surrounded by S, while the charge transition from AFI to AFM is caused by the percolation of the conducting paths generated by the Ni-Se-Ni bonds.
Hao, Y. Q.*; Wo, H. L.*; Gu, Y. M.*; Zhang, X. W.*; Gu, Y. Q.*; Zheng, S. Y.*; Zhao, Y.*; Xu, G. Y.*; Lynn, J. W.*; 中島 健次; et al.
Science China; Physics, Mechanics & Astronomy, 64(3), p.237411_1 - 237411_6, 2021/03
被引用回数：6 パーセンタイル：61.42(Physics, Multidisciplinary)We report thermodynamic and neutron diffraction measurements on the magnetic ordering properties of the honeycomb lattice magnet YbCl. We find YbCl exhibits a N
el type long-range magnetic order at the wavevector (0, 0, 0) below T
= 600 mK. This magnetic order is associated with a small sharp peak in heat capacity and most magnetic entropy release occurs above the magnetic ordering temperature. The magnetic moment lies in-plane, parallel to the monoclinic a-axis, whose magnitude m
= 0.86(3) 
is considerably smaller than the expected fully ordered moment of 2.24 for the doublet crystal-field ground state. The magnetic ordering moment gradually increases with increasing magnetic field perpendicular to the ab-plane, reaching a maximum value of 1.6(2) at 4 T, before it is completely suppressed above 
9 T. These results indicate the presence of strong quantum fluctuations in YbCl.
Wang, Y.*; Jia, G.*; Cui, X.*; Zhao, X.*; Zhang, Q.*; Gu, L.*; Zheng, L.*; Li, L. H.*; Wu, Q.*; Singh, D. J.*; et al.
Chem, 7(2), p.436 - 449, 2021/02
被引用回数：194 パーセンタイル：99.8(Chemistry, Multidisciplinary)Nanozymes are promising alternatives to natural enzymes, but their use remains limited owing to poor specificity. Overcoming this is extremely challenging due to the intrinsic structural complexity of these systems. We report theoretical design and experimental realization of a series of heterogeneous molybdenum single-atom nanozymes (named Mo
-N
-C), wherein we find that the peroxidase-like specificity is well regulated by the coordination numbers of single Mo sites. The resulting Mo-N
-C catalyst shows exclusive peroxidase-like behavior. It achieves this behavior via a homolytic pathway, whereas Mo-N-C and Mo-N-C catalysts have a different heterolytic pathway. The mechanism of this coordination-number-dependent enzymatic specificity is attributed to geometrical structure differences and orientation relationships of the frontier molecular orbitals.
GeWo, H.*; Wang, Q.*; Shen, Y.*; Zhang, X.*; Hao, Y.*; Feng, Y.*; Shen, S.*; He, Z.*; Pan, B.*; Wang, W.*; et al.
Physical Review Letters, 122(21), p.217003_1 - 217003_5, 2019/05
被引用回数：5 パーセンタイル：42.69(Physics, Multidisciplinary)We report neutron scattering measurements of single-crystalline YFeGe in the normal state, which has the same crystal structure as the 122 family of iron pnictide superconductors. YFeGe does not exhibit long-range magnetic order but exhibits strong spin fluctuations. Like the iron pnictides, YFeGe displays anisotropic stripe-type antiferromagnetic spin fluctuations at (
). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wave vector (
). These ferromagnetic spin fluctuations are isotropic in the (
) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFeGe and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials.
Chadwick, M. B.*; Capote, R.*; Trkov, A.*; Kahler, A. C.*; Herman, M. W.*; Brown, D. A.*; Hale, G. M.*; Pigni, M.*; Dunn, M.*; Leal, L.*; et al.
EPJ Web of Conferences, 146, p.02001_1 - 02001_9, 2017/09
被引用回数：6 パーセンタイル：95.25(Nuclear Science & Technology)CIELO共同研究では中性子断面積データの改善及びこれまでの評価で見られた断面積の不一致を解決することを目的として、原子力の臨界性に大きな影響を与える5核種(
O, 
Fe, 
U, 
Pu)の中性子断面積を評価している。この国際パイロットプロジェクトでは、経済協力開発機構・原子力機関・核データ評価国際協力ワーキングパーティに設置されたサブグループ40の下でIAEAからのサポートを受けて、実験並びに理論的な研究を活発に実施している。これらの研究を通じて測定データを精度よく反映し、さらに臨界性に関する積分テストで良い結果を示す新しい評価済ライブラリを開発している。
plasmas on JT-60U and DIII-D松永 剛; 岡林 典男*; 相羽 信行; Boedo, J. A.*; Ferron, J. R.*; Hanson, J. M.*; Hao, G. Z.*; Heidbrink, W. W.*; Holcomb, C. T.*; In, Y.*; et al.
Nuclear Fusion, 53(12), p.123022_1 - 123022_13, 2013/12
被引用回数：6 パーセンタイル：26.2(Physics, Fluids & Plasmas)In the wall-stabilized high- plasmas in JT-60U and DIII-D, interactions between energetic particle (EP) driven modes (EPdMs) and edge localized modes (ELMs) have been observed. The interaction between the EPdM and ELM are reproducibly observed. Many EP diagnostics indicate that strong correlation between the distorted waveform of the EPdM and the EP transport to edge. The waveform distortion is composed of higher harmonics 
and it looks like a density snake near the plasma edge. According to statistical analyses, the ELM triggering by the EPdMs needs finite level of waveform distortion and pedestal recovery. The ELM pacing by the EPdMs occurs when the repetition frequency of the EPdMs is higher than the natural ELM frequency. Transported EPs by the EPdMs are thought to contribute to change the edge stability.
Deng, Z.*; Zhao, K.*; Gu, B.; Han, W.*; Zhu, J. L.*; Wang, X. C.*; Li, X.*; Liu, Q. Q.*; Yu, R. C.*; 後神 達郎*; et al.
Physical Review B, 88(8), p.081203_1 - 081203_5, 2013/08
被引用回数：73 パーセンタイル：91.83(Materials Science, Multidisciplinary)We report the discovery of a diluted magnetic semiconductor, Li(Zn,Mn)P, in which charge and spin are introduced independently via lithium off-stoichiometry and the isovalent substitution of Mn
for Zn, respectively. Isostructural to (Ga,Mn)As, Li(Zn,Mn)P was found to be a 
-type ferromagnetic semiconductor with excess lithium providing charge doping. First-principles calculations indicate that excess Li is favored to partially occupy the Zn site, leading to hole doping. Ferromagnetism with Curie temperature up to 34 K is achieved while the system still shows semiconducting transport behavior.
/SrTiO (110) interfaceAnnadi, A.*; Zhang, Q.*; Renshaw Wang, X.*; Tuzla, N.*; Gopinadhan, K.*; L
, W. M.*; Roy Barman, A.*; Liu, Z. Q.*; Srivastava, A.*; Saha, S.*; et al.
Nature Communications (Internet), 4, p.1838_1 - 1838_7, 2013/05
被引用回数：97 パーセンタイル：94.65(Multidisciplinary Sciences)We report the observation of unexpected conductivity at the LaAlO/SrTiO interface prepared on (110)-oriented SrTiO, with a LaAlO-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.
松永 剛; 岡林 典男*; 相羽 信行; Boedo, J. A.*; Ferron, J. R.*; Hanson, J. M.*; Hao, G. Z.*; Heidbrink, W. W.*; Holcomb, C. T.*; In, Y.*; et al.
Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 8 Pages, 2013/03
In the wall-stabilized high- plasmas in JT-60U and DIII-D, interactions between energetic particle (EP) driven modes and MHD modes such as edge localized modes (ELMs) have been observed. The ELM triggering by EP driven modes (EPdMs) occurs when the repetition frequency of the EPdMs is higher than that of the ELM. The EPdMs have strong waveform distortion that is composed of higher toroidal harmonics. In particular, EP behavior seems to be sensitive to the waveform distortion, thus, waveform distortion can rapidly increase EP transport to edge. According to statistical analysis, the ELM triggering by the EPdMs infrequently occurs just after the ELM crash. Transported EPs by the EPdMs are thought to contribute to change the edge stability.
Shi, W.-Q.*; Fu, H.-Y.*; Bounds, P. L.*; 室屋 裕佐*; Lin, M.; 勝村 庸介*; Zhao, Y.-L.*; Chai, Z.-F.*
Radiation Research, 176(1), p.128 - 133, 2011/07
被引用回数：3 パーセンタイル：17.22(Biology)3-ニトロチロシン(3NT)は酸化ストレスや活性酸素(Reactive Oxygen Species)の発生源の重要な生物的マーカーであることが報告されている。本研究では、3-NTとその誘導体と、水和電子の反応で生ずる反応中間体の紫外,可視吸収スペクトルを測定し、芳香族ニトロアニオンとしての特徴を多く有することを明らかにした。また、3-NT,N-アセチル-3-ニトロチロシンエチルエーテル(NANTE),ニトロチロシンを含有するペプチド、及びグリシン-ニトロチロシン-グリシンと水和電子との反応性を中性水溶液中で測定し、その反応性がニトロ化していない物質との反応性より約二桁高いことを見いだした。さらに、3-NT存在下での水和電子の減衰速度のpH依存性も測定した。
X-ray emission from intense femtosecond laser-solid interactionsXu, M. H.*; Chen, L.-M.; Li, Y.-T.*; Yuan, X.-H.*; Liu, Y.-Q.*; 中島 一久; 田島 俊樹; Wang, Z.-H.*; Wei, Z.-Y.*; Zhao, W.*; et al.
Acta Physica Sinica, 56(1), p.353 - 358, 2007/01
被引用回数：5 パーセンタイル：37.28(Physics, Multidisciplinary)p分極されたフェムト秒のレーザー固体相互作用によって発生する相対論的な領域でのX線源の特徴を実験的に調べた。ナイフエッジのイメージ法を用いてCCDの単一光子カウントを行うことにより、のX線サイズ,スペクトル及び変換効率を測定した。実験結果はの光子の変換効率がシミュレーションの結果と異なり1.6
10
W/cm
のレーザーの強度で最適値7.0810
/srに達すること。X線変換効率が10%であること、及びレーザー強度1.610W/cmのときに前方芳香に電子が加速されることを発見した。
前田 敏克; 田中 忠夫; 向井 雅之; 小川 弘道; 山口 徹治; 宗像 雅広; 松本 潤子; 香西 直文; 馬場 恒孝; Fan, Z.*; et al.
日本原子力学会和文論文誌, 2(3), p.336 - 341, 2003/09
野外の通気層土壌中に埋設したベントナイト材及びセメント材中における90Sr,237Np及び238Puの移行試験を人工降雨による湿潤条件下及び自然降雨による乾燥条件下でおこなった。いずれの試験結果も、予測される水理条件やこれまでに明らかにされている現象と定性的に一致した。さらに、ベントナイト材については室内試験結果やこれまでに提案されている核種移行メカニズム等から分布を定量的に計算した。野外試験結果と計算結果とを比較することにより、野外における核種移行挙動は室内試験を始めとする既往の知見等からほぼ評価可能であることが分かった。
トカマクプラズマにおけるMHDモードの振舞い松永 剛; 岡林 典男*; 相羽 信行; Boedo, J. A.*; Ferron, J. R.*; Hanson, J. M.*; Hao, G. Z.*; Heidbrink, W. W.*; Holcomb, C. T.*; In, Y.*; et al.
no journal, ,
高運転では高い核融合出力密度を得ることができるため、コンパクトな原型炉が実現可能である。このような核燃焼・高領域では、MHD安定性が臨界安定に近く、かつ高エネルギーイオンが多数存在するためこれらの相互作用が予想される。JT-60U及びDIII-Dの壁なし限界を超える高プラズマにおいて、高エネルギーイオン駆動不安定性が発生し、抵抗性壁モードや周辺局在化モードを誘発する現象を観測した。これらの誘発現象には、高エネルギーイオン駆動不安定性によって増加した高エネルギーイオンの周辺への輸送がこれらの相互作用と関係していると考えられる。本講演ではJT-60UとDIII-Dでの実験結果について詳細に紹介する。
