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今井 正樹; 荒木 康史; 小野 凌太; 伊藤 孝; 一色 弘成; 吉川 貴史; 船戸 匠; 芳賀 芳範; 有沢 洋希*; 齊藤 英治; et al.
Journal of the Physical Society of Japan, 95(9), p.093703_1 - 093703_4, 2026/09
The temperature-gradient-induced Hall-like response has been reported in chiral tellurium; however, whether it originates from a static magnetization remains unclear. Here, we perform zero-field muon spin rotation (
SR) measurements on single-crystalline Te under a temperature gradient. No muon spin precession or static relaxation is observed. From the experimental sensitivity and dipolar-field estimates based on calculated muon stopping sites, we place an upper limit of 0.05 mT on the local magnetic field, corresponding to a magnetic moment smaller than 
per Te atom. These results rule out bulk static magnetization induced by temperature gradient as the origin of the Hall-like response.
MnO
Revealed by Micro-focused Angle-resolved Photoemission Spectroscopy and Tight-binding Models澤田 晏伯*; 芝田 悟朗; 齋藤 智彦*; 他7名*
Journal of the Physical Society of Japan, 95(8), p.084703_1 - 084703_7, 2026/08
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)We have investigated the electronic structure of LaSrMnO in the CE-type antiferromagnetic (CE-AFM) state below 
using micro-focused angle-resolved photoemission spectroscopy (
-ARPES) and tight-binding models. In agreement with the tight-binding calculations, we found a dispersive intensity around the X point in the -ARPES spectra, where the A-type antiferro-magnetic (A-AFM) band structure has no bands experimentally and theoretically, demonstrating that we have successfully captured the CE-AFM band structure for the first time. Including this intensity, many observed features were explained by the CE-AFM tight-binding bands, although some of them and the overall near-Fermi level intensity mapping can be explained by the A-AFM band structure. This indicates that the CE-AFM domain size would be no larger than the beam footprint size of a 
scale.
秋山 雅志*; 猪熊 祐輔; 大野 義章*
Journal of the Physical Society of Japan, 95(7), p.073702_1 - 073702_4, 2026/07
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)遷移金属カルコゲナイドは低次元構造を有し、組成変化により多様性を示すため次世代半導体材料として注目されている。特にTa
NiSe
系は、その多様性の一つとして光照射や外場により電子状態が大きく変化すると考えられている一方、その起源は未解明である。その起源の候補として、電子と正孔間のクーロン相互作用Uehは有力である。本研究では、Uehを解析できる動的平均場理論を用いて、キャリアドープ効果を解析した。その結果、強いUehにより形成された絶縁体状態は、キャリアドープによって重いキャリアを持つ半金属状態に変化することを明らかにした。本成果は従来のドープ増加に伴う金属化ではなく、電子の動きそのものが大きく変化する新知見である。本研究成果は、従来予測と異なる非自明な電子状態再編を引き起こす多様性を示しており、光照射や電界による電子状態制御に新指針を与えることが期待できる。
南 晶子*; 松野 治貴*; 森田 恭平*; 松木 麟太朗*; 小手川 恒*; 播磨 尚朝*; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦*; 藤 秀樹*
Journal of the Physical Society of Japan, 95(7), p.074711_1 - 074711_11, 2026/07
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)We performed 
Be-NMR measurements on UBe to probe its superconducting state. The Knight shift behavior indicates spin-triplet pairing with anisotropic spin susceptibility reduction below 
, providing strong evidence for a triplet state. The 
data support a multiband, fully gapped model, and symmetry analysis suggests an 
order parameter, consistent with a fully gapped spin-triplet topological superconductor.
Al
東中 隆二*; Iwami, Takuma*; Saito, Kosuke*; 伊藤 孝; 田端 千紘; 金子 耕士; 大原 高志; 鬼柳 亮嗣; 中尾 朗子*; 中村 惇平*; et al.
Journal of the Physical Society of Japan, 95(6), p.063702_1 - 063702_5, 2026/06
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Neutron scattering and muon spin rotation (mSR) measurements on single-crystal SmAuAl reveal magnetically ordered states associated with successive transitions at 2.8 K and 0.9 K. Magnetic Bragg peaks appear below TN with an incommensurate propagation vector q = (0.30, 0, 1.33). mSR detects spontaneous internal fields below 2.8 K, and the spectral shape is consistent with the incommensurate magnetic ordering. No anomalies are observed at 0.9 K, indicating that the magnetic structure remains essentially unchanged.
山本 将隆*; 日高 宏之*; 柳澤 達也*; 田端 千紘; 中尾 裕則*; 下村 晋*; 小野寺 秀也*; 網塚 浩*
Journal of the Physical Society of Japan, 95(5), p.053703_1 - 053703_4, 2026/05
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)We report on the negative magnetization (NM) phenomenon characterized by a spontaneous magnetization antiparallel to an applied magnetic field in an antiferromagnetic (AFM) carbide TbNiC. The NM phenomenon in this compound is observed in the AFM state with a field cooling process at low magnetic fields below 500 Oe. The monotonic decrease in magnetization below the Neel temperature of 25 K observed in temperature dependence measurement of magnetization for TbNiC cannot be explained by Neel's classical theory of ferrimagnetism. We propose a novel ferrimagnetic model in which the NM originates from phase coupling between charge density wave and AFM orders.
InGe studied by single crystal neutron diffraction田端 千紘; 金子 耕士; 中尾 朗子*; 大原 高志; 松田 達磨*; 大貫 惇睦*
Journal of the Physical Society of Japan, 95(5), p.053702_1 - 053702_4, 2026/04
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)The magnetic order of EuIrInGe, which crystallizes in a Dresselhaus-type noncentrosymmetric tetragonal structure, was investigated using two complementary single-crystal neutron diffraction approaches. Time-of-flight single-crystal diffraction reveals antiferromagnetic Bragg reflections with propagation vector q = (0, 0, 0) below the Neel temperature TN = 2.5 K, indicating a breaking of body-centered translational symmetry. Polarized neutron diffraction on a triple-axis spectrometer demonstrates that the ordered Eu2+ 4f moments lie within the basal plane and form a collinear antiferromagnetic structure with antiparallel alignment between corner and body-center sites. Despite the Dresselhaus-type spin splitting in the conduction bands, the magnetic order remains simple, implying weak coupling between localized moments and itinerant electrons.
Sb
with an ordered honeycomb network今津 毅士; 古谷 直也*; 足立 匡*; 工藤 一貴*; 今井 剛樹*; 御領 潤*
Journal of the Physical Society of Japan, 95(4), p.044704_1 - 044704_7, 2026/04
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)空間反転対称性を破る結晶構造をもつ蜂の巣格子超伝導体BaPtAsSbは超伝導転移温度のx依存性が非単調な振る舞いを示す。更にミューオンスピン緩和実験によりSbエンド(
=1)において自発磁場が観測され、時間反転対称性を破る超伝導状態が実現している可能性がある。BaPtAs(=0), BaPtSb(=1)の第一原理計算を行い、バンド構造を再現する有効強束縛模型を用いてギャップ方程式と凝縮エネルギーの解析を行い、安定となる超伝導対称性を議論した。その結果、BaPtAs(=0)では時間反転対称性のある従来型のs波超伝導とf波超伝導が安定化し、BaPtSb(=1)では時間反転対称性を破るカイラルd波状態が広く安定化することがわかった。この結果はミューオンスピン緩和実験とも整合する。また本論文で得られた知見は六方晶におけるカイラル超伝導相の探索に重要な指針を与える。
川井 弘之*; 関川 卓也; 尾崎 泰助*; 大野 義章*
Journal of the Physical Society of Japan, 94(12), p.124003_1 - 124003_15, 2025/12
被引用回数：1 パーセンタイル：34.76(Physics, Multidisciplinary)第一原理電子状態計算ソフトウェアOpenMXは密度汎関数理論に基づく計算コードであり、主に物質の安定構造や電子状態を求める際に利用される。本研究では、OpenMXを、通常は画像処理に使われるGPU (Graphics Processing Unit)を用いて、計算を高速化する手法開発を試みた。ダイヤモンド構造のシリコン512原子系におけるテスト計算の結果、CPUを用いた計算時間との比較で約2倍の高速化に成功した。また、磁気構造計算に使われるノンコリニア計算ではシリコン384原子系においてCPUの2.6倍の高速化に成功した。特にノンコリニア計算のGPUによる高速化はこれまでに例が無い。本研究で得られた成果によって、第一原理電子状態計算でこれまでより大規模な系を扱うことが可能になる。
=1/2 Ising-like antiferromagnetic chain CsCoCl in transverse magnetic fields木村 尚次郎*; 大西 弘明; 鳴海 康雄*; 奥西 巧一*; 萩原 政幸*; 金道 浩一*; 菊池 彦光*
Journal of the Physical Society of Japan, 94(12), p.124703_1 - 124703_8, 2025/12
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)We have performed high-field electron spin resonance (ESR) measurements on the =1/2 Ising-like one-dimensional (1D) antiferromagnet CsCoCl in the frequency range up to 3.1 THz and magnetic fields 
for 
up to 53 T, as well as density-matrix renormalization group (DMRG) calculations. The analysis of the high-field magnetization confirms that the quantum critical point in the transverse field is 
= 60.3 T. The results of the ESR measurements suggest the remarkable behavior that all the excitation branches coming from the Zeeman ladder converge to upon increasing the transverse fields. The ESR measurements with polarized electromagnetic waves show that the ESR absorption lines show clear polarization dependence. The absorption lines, which become soft in the transverse field, are revealed to couple with the magnetic field oscillating parallel to the static magnetic fields. These experimental results are compared with the detailed DMRG calculations.
Be nuclear magnetic resonance in UBe; Itinerant-localized duality and possible Fermi surface reconstruction at high magnetic field松木 麟太朗*; 南 晶子*; 小手川 恒*; 播磨 尚朝*; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦*; 藤 秀樹*
Journal of the Physical Society of Japan, 94(12), p.124702_1 - 124702_8, 2025/11
被引用回数：1 パーセンタイル：34.76(Physics, Multidisciplinary)We report on new results of Be nuclear magnetic resonance measurements conducted on a single crystal of the heavy fermion superconductor UBe. A comparison between the knight shift and the classical dipolar shift provides microscopic evidence for the nature of an itinerant-localized duality in UBe. Furthermore, a reconstruction of part of the multiple Fermi surfaces in the high-magnetic-field region is suggested.
Ti)NiSe
土田 駿*; 廣瀬 雄介; 関川 卓也; 大野 義章*; 平原 卓也*; 佐野 純佳*; 河口 彰吾*; 小林 慎太郎*; 上床 美也*; 摂待 力生*
Journal of the Physical Society of Japan, 94(11), p.114703_1 - 114703_7, 2025/10
被引用回数：2 パーセンタイル：55.25(Physics, Multidisciplinary)本研究では、励起子絶縁体TaNiSeへのキャリアドープ効果を調べるために、(TaTi)NiSeの単結晶合成し、電気抵抗
ホール係数
およびバンド計算を行った。TaサイトのTi元素置換により、結晶構造は変化せず励起子絶縁体転移温度
は連続的に抑制され=0.104で83Kまで抑制された。置換量を増やしていくと、半導体的なやの低温での増大が著しく抑制され、
では金属的な振る舞いに変わることを見出し、励起子相関のある金属状態が実現されている可能性がある。この金属化はバンド計算により、キャリアドーピング効果によって説明できる。このキャリアドープ物質を加圧していくと、2.6GPa以上で超伝導となることを明らかにした。この圧力は母物質TaNiSeの圧力誘起超伝導が現れる8GPaよりもはるかに小さく、Ti置換によるキャリアドープが超伝導に有利に働いたと考えられる。
Si神戸 振作; 石飛 尊之; 播磨 尚朝*
Journal of the Physical Society of Japan, 94(10), p.104703_1 - 104703_5, 2025/10
[100]方向および[110]方向に沿った一軸応力下におけるURuSiの隠れた秩序状態の研究である。一軸応力下で誘起される空間群と秩序パラメータは、実験事実と群論的考察に基づいて推定される。一軸応力下での測定を用いて隠れた秩序の秩序パラメータを同定する手法を提案する。
井上 悠平*; 野々山 朋信*; Kang, Z.; 藪中 俊介; 津川 暁
Journal of the Physical Society of Japan, 94(9), p.094001_1 - 094001_6, 2025/09
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Particles that self-propel owing to changes in their own internal state are called self-propelled particles and are driven by the Marangoni effect caused by concentration and/or temperature gradients. As the propulsion speed increases, they become elliptically shaped. However, the driving forces behind this phenomenon are still not completely understood. Therefore, we used a numerical method to confirm whether elliptical deformation actually occurred in the self-propulsion of a droplet, and quantitatively confirmed how the surface tension of the droplet changed. As a result, we confirmed that the second mode of the surface tension was the driving force of the contour of the droplet. Furthermore, the competing combination of the fluid pressure gradient and Korteweg force associated with the reacting molecules was the actual driving force of the fluid that induced a self-organized flow.
Cm(
Ti,xn)
Og reaction cross sectionGall, B. J.-P.*; 浅井 雅人; 伊藤 由太; 豊嶋 厚史*; 他30名*
Journal of the Physical Society of Japan, 94(9), p.094201_1 - 094201_9, 2025/09
被引用回数：3 パーセンタイル：68.00(Physics, Multidisciplinary)TiビームをCm標的に照射してOg同位体を探索する実験を理化学研究所の仁科加速器科学研究センターにて実施した。準弾性後方散乱の励起関数から導出した準弾性散乱障壁分布より最適ビームエネルギーを決定した。実験の結果、Og同位体の崩壊は見つからず、1事象検出断面積として0.27pb、1
信頼度の断面積上限値として0.50pbの値を見積もることができた。
田端 千紘; 今 布咲子*; 日比野 瑠央*; 清水 悠晴*; 網塚 浩*; 金子 耕士; 本間 佳哉*; 青木 大*; 中尾 裕則*
Journal of the Physical Society of Japan, 94(8), p.083701_1 - 083701_5, 2025/07
被引用回数：5 パーセンタイル：76.34(Physics, Multidisciplinary)Resonant X-ray scattering at the uranium M4 edge revealed successive phase transitions in URhSn. An antiferro-quadrupole (AFQ) order with propagation vector q = 0 emerges between 16 K and 54 K. Below 16 K, this AFQ order coexists with a canted magnetism, leading to a ground state that breaks mirror symmetry and exhibits chirality or polarity.
久保 勝規
Journal of the Physical Society of Japan, 94(7), p.074701_1 - 074701_5, 2025/07
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Surface states of a tight-binding model with nearest-neighbor hopping on a diamond lattice of finite thickness are investigated. We consider systems with (001), (110), and (111) surfaces. Even if the surface direction is fixed, there is freedom to choose the surface structure due to the two-sublattice nature of a diamond lattice. The existence of surface states is governed by the topology of the matrix elements of the bulk Hamiltonian. In this sense, the existence of surface states is determined by the bulk Hamiltonian. However, the matrix elements depend on the choice of the unit cell, which should be chosen to conform to the surface structure. Thus, the surface states depend on the surface structure. We find that for each surface direction, there are two choices of surface structure, and depending on the chosen structure, the corresponding surface states emerge in distinct regions of the surface Brillouin zone.
石飛 尊之
Journal of the Physical Society of Japan, 94(7), p.075001_1 - 075001_2, 2025/07
被引用回数：1 パーセンタイル：34.76(Physics, Multidisciplinary)We show that superzone gap formation-phenomena usually attributed to antiferroic ordering-can also arise from ferroic orders in materials featuring sublattice structures. Through an analysis of a 
-orbital tight-binding model on a zigzag chain, we reveal that ferroquadrupolar or ferromagnetic ordering, as well as external magnetic fields, can generate a Su-Schrieffer-Heeger-type gap.
and CeRuGe川崎 郁斗; 藤森 伸一; 山上 浩志; 松田 達磨*; 大貫 惇睦*
Journal of the Physical Society of Japan, 94(8), p.084702_1 - 084702_9, 2025/07
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)The electronic state of CeCu, an archetypical heavy compound without long-range magnetic order, has been investigated by angle-resolved photoemission spectroscopy (ARPES) experiments using soft X rays. The Ce 3
-4
resonant ARPES experiments have revealed the 4 partial density of states consists of a quasiparticle band near the Fermi level (
component) and an 
component, the latter of which is physically equivalent to the lower Hubbard band in the Hubbard model. The observed strong intensity of the component indicates that the quasiparticle band near the Fermi level is strongly renormalized by the electron correlation effect, consistent with the significantly enhanced electronic specific-heat coefficient of CeCu. We compare the present 3-4 resonant ARPES spectra of CeCu with those for CeRuGe, which has a low Kondo temperature similar to CeCu but shows a ferromagnetic order. The results of this comparison suggest that the ferromagnetic correlation in CeRuGe seems to strongly suppress the degree of renormalization for the quasiparticle band. We also showed that the intensities of both the and components for CeCu hardly depend on temperature.
門野 良典*; 伊藤 孝
Journal of the Physical Society of Japan, 94(6), p.064601_1 - 064601_11, 2025/06
被引用回数：10 パーセンタイル：90.50(Physics, Multidisciplinary)We extend the previously published model that distinguishes between the diffusive motion of diamagnetic muons and the dynamics of ions around the muon in matter, and propose a generalized model for 
(Mu
s, bound states of a muon and an unpaired electron) observed in non-metallic host materials. The new model distinguishes among the independent motion of unpaired electron associated with Mu, the self-diffusive motion of Mu as single atomic entity, and that of the ions surrounding Mu, where the muon spin relaxation is induced by dynamical fluctuations of the hyperfine (HF) field exerted from the unpaired electron (e.g., due to spin/charge exchange reaction) and/or that of the nuclear hyperfine (NHF) interactions between the unpaired electron and the surrounding ions. We have applied this model to the muonated radicals (Mus in a polaron state) in conducting polymers, and examined the validity of the interpretations claimed in the earlier literature that the spin relaxation is induced by quasi-one dimensional jump motion of the unpaired electron. The result suggests that experimental support for such a claim is still inadequate and needs to be reexamined, including the possibility of other origins for the fluctuations. It is expected that our model will prove a useful guide for SR studies of various local dynamics involving paramagnetic muon states.
