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論文

Impact of the ground-state 4 symmetry for anisotropic hybridization in the heavy-fermion superconductor CeNi $_{2}$ Ge $_{2}$

藤原秀紀*; 中谷泰博*; 荒谷秀和*; 金井惟奈*; 山神光平*; 濱本諭*; 木須孝幸*; 山崎篤志*; 東谷篤志*; 今田真*; et al.

Physical Review B, 108(16), p.165121_1 - 165121_10, 2023/10

https://doi.org/10.1103/PhysRevB.108.165121

被引用回数：0 パーセンタイル：0(Materials Science, Multidisciplinary)

We report the ground-state symmetry of the Ce 4 states in the heavy-fermion superconductor CeNi $_{2}$ Ge $_{2}$ , yielding anisotropic hybridization between the Ce 4 states and conducting electrons. By analyzing linear dichroism in soft X-ray absorption and core-level hard X-ray photoemission spectra, the 4 symmetry is determined as -type $_{7}$ , promoting predominant hybridization with the conducting electrons originating from the Ge site. The band structures probed by soft X-ray angle-resolved photoemission indicates that the Ge 4 components contribute to the band renormalization through the anisotropic hybridization effects, suggesting that the control of the electronic structures of Ge orbital gives an impact to achieve the exotic phenomena in CeNi $_{2}$ Ge $_{2}$ .

論文

Coexistence of magnetoelectric and antiferroelectric-like orders in Mn $_{3}$ Ta $_{2}$ O $_{8}$

木村健太*; 八木直輝*; 長谷川舜介*; 萩原雅人; 三宅厚志*; 徳永将史*; Cao, H.*; 益田隆嗣*; 木村剛*

Inorganic Chemistry, 60(20), p.15078 - 15084, 2021/10

https://doi.org/10.1021/acs.inorgchem.1c02461

被引用回数：1 パーセンタイル：10.45(Chemistry, Inorganic & Nuclear)

In materials showing a linear magnetoelectric (ME) effect, unconventional functionalities can be anticipated such as electric control of magnetism and nonreciprocal optical responses. Thus, the search of new linear ME materials is of interest in materials science. Here, using a recently proposed design principle of linear ME materials, which is based on the combination of local structural asymmetry and collinear antiferromagnetism, we demonstrate that an anion-deficient fluorite derivative Mn $_{3}$ Ta $_{2}$ O $_{8}$ is a new linear ME material. This is evidenced by the onset of magnetic-field-induced electric polarization in its collinear antiferromagnetic phase below $T_{rm N}$ = 24 K. Furthermore, we also find an antiferroelectric-like phase transition at $T_{rm S}$ = 55 K, which is attributable to an off-center displacement of magnetic Mn $^{2+}$ ions. The present study shows that Mn $_{3}$ Ta $_{2}$ O $_{8}$ is a rare material that exhibits both ME and antiferroelectric-like transitions. Thus, Mn $_{3}$ Ta $_{2}$ O $_{8}$ may provide an opportunity to investigate the physics associated with complicated interactions between magnetic (spin) and electric dipole degrees of freedom.

論文

Anisotropic physical properties of layered antiferromagnet UPtGa $_{15}$

松本裕司*; 芳賀芳範; 山本悦嗣; 竹内徹也*; 三宅厚志*; 徳永将史*

Journal of the Physical Society of Japan, 90(7), p.074707_1 - 074707_6, 2021/07

https://doi.org/10.7566/JPSJ.90.074707

被引用回数：0 パーセンタイル：0(Physics, Multidisciplinary)

A uranium intermetallic compound UPtGa $_{15}$ was successfully synthesized. This compound crystallizes in the hexagonal Sc $_{0.6}$ FeSi $_{4.9}$ -type structure. Antiferromagnetic transition with highly magnetic anisotropy was established by the physical property measurements.

論文

Spin excitations of the =1/2 one-dimensional Ising-like antiferromagnet BaCo $_{2}$ V $_{2}$ O $_{8}$ in transverse magnetic fields

奥谷顕*; 大西弘明; 木村尚次郎*; 竹内徹也*; 木田孝則*; 森道康; 三宅厚志*; 徳永将史*; 金道浩一*; 萩原政幸*

Journal of the Physical Society of Japan, 90(4), p.044704_1 - 044704_9, 2021/04

https://doi.org/10.7566/JPSJ.90.044704

被引用回数：3 パーセンタイル：30.35(Physics, Multidisciplinary)

The high-field multifrequency electron spin resonance (ESR), the magnetization, and the specific heat of single crystals of BaCo $_{2}$ V $_{2}$ O $_{8}$ (a quasi-one-dimensional Ising-like antiferromagnet with ) were measured in two different transverse magnetic fields: and . A softening of the lowest ESR mode was observed near the saturation field of the magnetization around 40 T in , whereas it occurs around 10 T in , far below the saturation field. These observations were reproduced by numerical calculations using the density-matrix renormalization group methods, including the staggered magnetic fields induced by a uniform external magnetic field and the interchain magnetic exchange interaction. We found that the directional dependence of the lowest mode originates mainly from the remarkable angular dependence of the induced magnetic field. The interchain interaction is also quantitatively important for reproducing the experimental results. The directional dependence of the lowest mode is demonstrated by the particle-hole excitation of spinons using the Jordan-Wigner transformation.

論文

Strong magnetic anisotropy and unusual magnetic field reinforced phase in URhSn with a quasi-kagome structure

清水悠晴*; 三宅厚志*; Maurya, A.*; 本多史憲*; 仲村愛*; 佐藤芳樹*; Li, D.*; 本間佳哉*; 横山淳*; 徳永陽; et al.

Physical Review B, 102(13), p.134411_1 - 134411_11, 2020/10

https://doi.org/10.1103/PhysRevB.102.134411

被引用回数：5 パーセンタイル：26.53(Materials Science, Multidisciplinary)

The physical properties of URhSn with quasi-kagome structure are studied using single-crystalline samples via electrical resistivity, magnetic susceptibility, heat capacity, thermal expansion, and high-field magnetization measurements. We found remarkable magnetic anisotropy in the ferromagnetic state below 16 K as well as in the ordered state between 16 K and 54 K.

論文

Intriguing behavior of UCo $_{1-x}$ RhGe ferromagnets in magnetic field along the axis

Pospil, J.*; 芳賀芳範; 三宅厚志*; 神戸振作; 徳永陽; 徳永将史*; 山本悦嗣; Proschek, P.*; Voln, J.*; Sechovsk, V.*

Physical Review B, 102(2), p.024442_1 - 024442_13, 2020/07

https://doi.org/10.1103/PhysRevB.102.024442

被引用回数：6 パーセンタイル：38.95(Materials Science, Multidisciplinary)

Alloying study of ferromagnetic superconductors URhGe and UCoGe is reported. The Curie temperature shows a maximum at Rh concentration = 0.4 in UCo $_{1-x}$ RhGe. Magnetic characteristices in low- and high- regions are significantly different each other. The relationship between magnetism and superconductivity are discussed.

論文

Magnetic structures and quadratic magnetoelectric effect in LiNiPO $_{4}$ beyond 30 T

Fogh, E.*; 木原工*; Toft-Petersen, R.*; Bartkowiak, M.*; 鳴海康雄*; Prokhnenko, O.*; 三宅厚志*; 徳永将史*; 及川健一; Srensen, M. K.*; et al.

Physical Review B, 101(2), p.024403_1 - 024403_12, 2020/01

https://doi.org/10.1103/PhysRevB.101.024403

被引用回数：15 パーセンタイル：71.02(Materials Science, Multidisciplinary)

Neutron diffraction with static and pulsed magnetic fields is used to directly probe the magnetic structures in LiNiPO $_{4}$ up to 25 T and 42 T, respectively. By combining these results with magnetometry and electric polarization measurements under pulsed fields, the magnetic and magnetoelectric phases are investigated up to 56 T applied along the easy axis. In addition to the already known transitions at lower fields, three new ones are reported at 37.6, 39.4, and 54 T. Ordering vectors are identified with Q $_{rm VI}$ = (0, $frac{1}{3}$ , 0) in the interval 37.6 - 39.4 T and Q $_{rm VII}$ = (0, 0, 0) in the interval 39.4 - 54 T. A quadratic magnetoelectric effect is discovered in the Q $_{rm VII}$ = (0, 0, 0) phase and the field dependence of the induced electric polarization is described using a simple mean-field model. The observed magnetic structure and magnetoelectric tensor elements point to a change in the lattice symmetry in this phase. We speculate on the possible physical mechanism responsible for the magnetoelectric effect in LiNiPO $_{4}$ .

論文

Magnetic and electrical properties of the ternary compound UIrSi with one-dimensional uranium zigzag chains

Li, D. X.*; 本多史憲*; 三宅厚志*; 本間佳哉*; 芳賀芳範; 仲村愛*; 清水悠晴*; Maurya, A.*; 佐藤芳樹*; 徳永将史*; et al.

Physical Review B, 99(5), p.054408_1 - 054408_9, 2019/02

https://doi.org/10.1103/PhysRevB.99.054408

被引用回数：5 パーセンタイル：27.67(Materials Science, Multidisciplinary)

Physical properties of the single-crystalline UIrSi, a new ternary uranium compound with UCoSi-type orthorhombic structure, are investigated by means of magnetic susceptibility, specific heat and electrical resistivity. This compound undergoes an antiferromagnetic transition followed by a first-order phase transition at lower temperature. A possible mechanism of the first-order transition is the occurrence of a magnetic magnetic quadrupolar order, resulting from the quasi-one-dimensional uranium zigzag chain.

論文

Magnetic field induced phenomena in UIrGe in fields applied along the axis

Pospil, J.*; 芳賀芳範; 小濱芳允*; 三宅厚志*; 神戸振作; 立岩尚之; Valika, M.*; Proschek, P.*; Prokleka, J.*; Sechovsk, V.*; et al.

Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07

https://doi.org/10.1103/PhysRevB.98.014430

被引用回数：16 パーセンタイル：61.77(Materials Science, Multidisciplinary)

The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity, and magnetocaloric effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic axis. The first-order transition is accompanied by a dramatic increase of the Sommerfeld coefficient. A tentative scenario explaining these anomalies by antiferromagnetic correlations or short-range order in the paramagnetic state is discussed.

論文

X-ray absorption spectroscopy and novel electronic properties in heavy fermion compounds YbT $_{2}$ Zn $_{20}$ (T: Rh and Ir)

本多史憲*; 広瀬雄介*; 三宅厚志*; 水牧仁一朗*; 河村直己*; 筒井智嗣*; 綿貫徹; 渡辺真仁*; 竹内徹也*; 摂待力生*; et al.

Journal of Physics; Conference Series, 592(1), p.012021_1 - 012021_5, 2015/03

https://doi.org/10.1088/1742-6596/592/1/012021

被引用回数：3 パーセンタイル：72.17(Physics, Atomic, Molecular & Chemical)

重い電子系化合物YbT $_{2}$ Zn $_{20}$ (T: Rh and Ir)について、X線吸収分光法によりYb価数観察を行った。いずれの化合物でもYb価数は温度依存性を示し、約100K以下で冷却とともにYb価数が減少する変化が見られた。これは、同型化合物であるYbCo $_{2}$ Zn $_{20}$ において温度依存性が見られないこととは対照的な結果である。

論文

Field-induced phenomena in ferromagnetic superconductors UCoGe and URhGe

青木大*; Taupin, M.*; Paulsen, C.*; Hardy, F.*; Taufour, V.*; 小手川恒*; Hassinger, E.*; Malone, L.*; 松田達磨; 三宅厚志*; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB002_1 - SB002_6, 2012/12

https://doi.org/10.1143/JPSJS.81SB.SB002

被引用回数：3 パーセンタイル：26.68(Physics, Multidisciplinary)

We review our recent studies on ferromagnetic superconductors, UGe2, URhGe, and UCoGe. We focus on experimental results of URhGe and UCoGe in which the superconductivity occurs already at ambient pressure. The huge upper critical field $_{c2}$ on UCoGe for the field along the hard magnetization axis (-axis) is confirmed by the AC susceptibility measurements by the fine tuning of field angle. Contrary to the huge $_{c2}$ along the hard-magnetization axis, $_{c2}$ along the easy-magnetization axis (-axis) is relatively small in value. However, the initial slope of $_{c2}$ , namely $_{c2}$ / (0) both in UCoGe and in URhGe indicates the large value, which can be explained by the magnetic domain effect detected in the magnetization measurements. The specific heat measurements using a high quality single crystal of UCoGe demonstrate the bulk superconductivity, which is extended under magnetic field for the field along -axis.

論文

Properties of ferromagnetic superconductors

青木大*; Hardy, F.*; 三宅厚志*; Taufour, V.*; 松田達磨; Flouquet, J.*

Comptes Rendus Physique, 12(5-6), p.573 - 583, 2011/06

https://doi.org/10.1016/j.crhy.2011.04.007

被引用回数：34 パーセンタイル：80.35(Astronomy & Astrophysics)

Thanks to the discovery in the last decade of three uranium ferromagnetic superconductors, UGe, URhGe and UCoGe, the fascinating aspects of the interplay between the triplet state of Cooper pairing and ferromagnetism have emerged. Furthermore, as the ferromagneticproperties in the normal state are quite different with respect to the proximity of the ferromagnetic-paramagnetic instabilities, the feedback with the coexistence of superconductivity gives rise to quite different boundaries in pressure and magnetic field. Specialattention is given on the location of the materials with respect to the tricriticality and on the reinforcement of SC in a transverse field response with respect to the direction of the FM sublattice magnetization.

論文

Electrical resistivity measurements of single crystalline -Mn under high pressure

三宅厚志*; 金政泰介*; 八木良平*; 加賀山朋子*; 清水克哉*; 芳賀芳範; 大貫惇睦

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e222 - e224, 2007/03

アルファマンガンの単結晶試料を用いて高圧下電気抵抗測定を行った。アルファマンガンは転移温度95Kの反強磁性物質であり、結晶学的に異なる4つのマンガンサイトがある。アルファマンガンの磁気転移温度は加圧とともに低温側にシフトし、転移温度における鋭い抵抗異常は鈍いkinkへと変化し、異なる磁気秩序相が高圧下で形成されていることを示唆された。1.9GPaの相境界では、残留抵抗が急減に減少し、電気抵抗のの係数Aがピークを形成することが明らかにされた。

口頭

層状構造を持つウラン化合物UPtAl $_{15}$ の結晶構造と物性

芳賀芳範; 常盤欣文; 山本悦嗣; 三宅厚志*; 徳永将史*

no journal, ,

UPtAl $_{15}$ の物性を報告する。10K及び25K付近に、磁気相転移を有する。両者は磁場中で異なる温度依存性を示し、その磁気特性は複雑である。同型の反強磁性体UPtGa $_{15}$ と対比しつつ、それらの起源について議論する。

口頭

High field magnetization of UOX (X = S and Se)

Opletal, P.; 酒井宏典; 芳賀芳範; 三宅厚志*; 徳永将史*; 常盤欣文; 山本悦嗣; 神戸振作; 徳永陽

no journal, ,

UOX (X = S, Se, Te) crystallizes in tetragonal PbFCl-type structure (P4/nmm space group). Only polycrystalline samples are reported in literature. UOS, UOSe and UOTe were reported to be antiferromagnets with TN = 55, 100 and 160 K, respectively. We have presented recently that TN in UOS is much higher (TN = 82 K) and all compounds behave like semimetals. Magnetic structure of UOS and UOSe were reported to have moment along the c-axis with Q = (0,0,1/2). UOTe was theoretically predicted to have nontrivial topology. We will present the results of magnetization measurements in high magnetic fields for UOS and UOSe and their phase diagrams and their tricritical point. We will compare our results to current understanding of tricritical points in antiferromagnet and discuss possible scenarios.

口頭

Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.; 酒井宏典; 芳賀芳範; 三宅厚志*; 徳永将史*; 常盤欣文; 山本悦嗣; 神戸振作; 徳永陽

no journal, ,

UOX (X = S, Se, Te) crystallizes in tetragonal PbFCl-type structure (P4/nmm space group). Only polycrystalline samples are reported in literature. UOS, UOSe and UOTe were reported to be antiferromagnets with T $_{N}$ = 55, 100 and 160 K, respectively. Magnetic structure of UOS and UOSe were reported to have moment along the c-axis with Q = (0,0,1/2). UOS and UOSe were both reported to exhibit semiconducting behavior on polycrystalline samples. UOTe was theoretically predicted to have nontrivial topology. We have prepared first single crystals of UOX (X = S, Se, Te) and shown they exhibit semimetallic conductivity and UOS exhibits increase of T $_{N}$ by almost 30 K in contrast to published literature. We will present the method of preparation of single crystals, results of magnetic, transport, thermal measurements, all effect and data obtained in high magnetic fields. We will discuss these results in connection to Weyl semimetals and results published in literature and anisotropy observed in electric resistivity.

口頭

Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.; 酒井宏典; 芳賀芳範; 三宅厚志*; 徳永将史*; 常盤欣文; 山本悦嗣; 神戸振作; 徳永陽

no journal, ,

UOX (X = S, Se, Te) crystallizes in tetragonal PbFCl-type structure (P4/nmm space group). Only polycrystalline samples are reported in literature. UOS, UOSe and UOTe were reported to be antiferromagnets with T $_{mathrm{N}}$ = 55, 100 and 160 K, respectively. Magnetic structure of UOS and UOSe were reported to have moment along the c-axis with Q = (0,0,1/2). UOS and UOSe were both reported to exhibit semiconducting behavior on polycrystalline samples. UOTe was theoretically predicted to have nontrivial topology. We have prepared first single crystals of UOX (X = S, Se, Te) and shown they exhibit semimetallic conductivity and UOS exhibits increase of T $_{mathrm{N}}$ by almost 30 K in contrast to published literature. We will present the method of preparation of single crystals, results of magnetic, transport, thermal measurements, all effect and data obtained in high magnetic fields. We will discuss these results in connection to Weyl semimetals and results published in literature and anisotrpy observed in electric resistivity.