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magnetic order in trillium lattice antiferromagnet EuPtSi studied by resonant X-ray scattering田端 千紘*; 松村 武*; 中尾 裕則*; 道村 真司*; 垣花 将司*; 稲見 俊哉*; 金子 耕士; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*
Journal of the Physical Society of Japan, 88(9), p.093704_1 - 093704_5, 2019/09
The magnetic order in the magnetic-fild-induced so-called A phase of cubic chiral antiferromagnet EuPtSi was investigated by resonant X-ray scattering (RXS) near the Eu 
edge. The high flux RXS signal under the magnetic field applied along [111] revealed the first and second order satellite magnetic reflections, indicating that the A phase is a triple- magnetic ordered state that is described by three propagation vectors lying in the plane normal to the magnetic field direction; 
, 
, and 
. With the high resolution in the reciprocal space achieved in the RXS measurement, it is suggested that the triple- order strongly couples with the underlying crystal lattice. The triple- magnetic order is discussed in the context of a magnetic skyrmion lattice on which the geometrical frustration may play a crucial role.
伊覇 航*; 垣花 将司*; 松田 進弥*; 本多 史憲*; 芳賀 芳範; 竹内 徹也*; 中島 美帆*; 天児 寧*; 郷地 順*; 上床 美也*; et al.
Journal of Alloys and Compounds, 788, p.361 - 366, 2019/06
Ferromagnetic ordering of EuCuP is investigated on a single crystal sample grown from tin flux. Application of hydrostatic pressure up to 8 GPa stabilizes ferromagnetic ordering, suggesting divalent Eu is stable. The Hall effect and resistivity measurements show that EuCuP is a low-carrier ferromagnetic metal with a characteristic resistivity cusp appearing at the ferromagnetic transition temperature.
金子 耕士; Frontzek, M. D.*; 松田 雅昌*; 中尾 朗子*; 宗像 孝司*; 大原 高志; 垣花 将司*; 芳賀 芳範; 辺土 正人*; 仲間 隆男*; et al.
Journal of the Physical Society of Japan, 88, p.013702_1 - 013702_5, 2019/01
被引用回数：1 パーセンタイル：14.05(Physics, Multidisciplinary)Magnetic transitions in chiral antiferromagnet EuPtSi were investigated by means of single crystal neutron diffraction. In the ground state, magnetic peaks emerge at positions represented by 
=
. Upon heating, an additional magnetic peak splitting around 2.5 K was uncovered, indicating a presence of a first-order transition with 
=
. An half-polarized neutron scattering for polarization parallel to Q reveled that polarization antiparallel to Q has stronger intensity in both magnetic phases. This feature clarifies single chiral character of helical structure with moments normal to the ordering vector in both ordered states. Under vertical magnetic field along [1,1,1] in the 
phase, magnetic peaks form hexagonal patterns in the equatorial scattering plane around nuclear. An ordering vector 
of the -phase has the similar size in the periodicity to , and could be a hallmark of a formation of skyrmion lattice in EuPtSi.
Si竹内 徹也*; 屋良 朝之*; 安次富 洋介*; 伊覇 航*; 垣花 将司*; 中島 美帆*; 天児 寧*; 本多 史憲*; 本間 佳哉*; 青木 大*; et al.
Journal of the Physical Society of Japan, 87(7), p.074709_1 - 074709_14, 2018/07
被引用回数：2 パーセンタイル：29.91(Physics, Multidisciplinary)Effects of magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPtSi were studied using single-crystalline samples. Anomalous features in EuPtSi are due to valence fluctuation and/or valence change of the Eu ions at low temperatures.
(Ge
Si
) based on the doniach phase diagram伊覇 航*; 屋良 朝之*; 安次富 洋介*; 垣花 将司*; 竹内 徹也*; 本多 史憲*; 仲村 愛*; 青木 大*; 郷地 順*; 上床 美也*; et al.
Journal of the Physical Society of Japan, 87(6), p.064706_1 - 064706_14, 2018/06
被引用回数：2 パーセンタイル：29.91(Physics, Multidisciplinary)We succeeded in growing single crystals of the series of EuCu(GeSi) compounds.Physical property measurements demonstrate a maximum of the antiferromagnetic transition temperature appears at 
. Antiferromagnetism then disappears around 
followed by a heavy-fermion formation at higher concentrations. These observations follow the Doniach phase diagram as a function of 
.
Co照屋 淳志*; 垣花 将司*; 竹内 徹也*; 青木 大*; 本多 史憲*; 仲村 愛*; 芳賀 芳範; 松林 和幸*; 上床 美也*; 播磨 尚朝*; et al.
Journal of the Physical Society of Japan, 85(3), p.034706_1 - 034706_10, 2016/03
パーセンタイル：100(Physics, Multidisciplinary)Superconducting characteristics and Fermi surfaces of ZrCo are experimentally studied on a single crystal sample grown by Bridgman technique. Thermodynamic quantities in the superconducting state such as specific heat and magnetization show deviation from a single-gap the BCS model and can be attributed on the band structure with the dominant contribution of Zr-4
and Co-3 components.
垣花 将司*; 照屋 淳志*; 西村 憲吾*; 仲村 愛*; 竹内 徹也*; 芳賀 芳範; 播磨 尚朝*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦
Journal of the Physical Society of Japan, 84(9), p.094711_1 - 094711_8, 2015/09
被引用回数：8 パーセンタイル：31.29(Physics, Multidisciplinary)Fermi surface properties of illuminate NiSbS and PbBiSe have been clarified by de Haas-van Alphen effect, resistivity and specific heat measurements. Fermi surfaces were found to split into two, reflecting the non-centrosymmetric crystal structure. The splitting energies have been estimated experimentally. Those are originated from spin-orbit interactions.
金子 耕士; Frontzek, M. D.*; 松田 雅昌*; 中尾 朗子*; 宗像 孝司*; 大原 高志; 垣花 将司*; 芳賀 芳範; 辺土 正人*; 仲間 隆男*; et al.
no journal, ,
空間群
に属する空間反転対称性を持たない立方晶化合物EuPtSiでは、Euイオンは2価の安定状態で7
Bの大きなモーメントを持ち、比較的低温の
=4.0Kで反強磁性秩序を示す。磁場により中間温度領域にのみ誘起される、MnSiのスキルミオン相と類似した特徴的な磁場誘起相が現れること、その秩序相内でホール抵抗の増大が観測されていることから、高い注目を集めている。本研究では、磁気構造を明らかにすることを目的として単結晶中性子回折を行い、ゼロ磁場ではキラリティーを有する特徴的な磁気構造を持つこと、秩序相内で新たな転移の存在などを明らかにした。その詳細について報告する。
金子 耕士; Frontzek, M. D.*; 松田 雅昌*; 大石 一城*; 中尾 朗子*; 宗像 孝司*; 大原 高志; 垣花 将司*; 芳賀 芳範; 辺土 正人*; et al.
no journal, ,
立方晶EuPtSiはMnSiと同様の空間群に属するキラル反強磁性体で、バルク測定などから磁場中で磁気スキルミオン格子の実現が示唆されている。今回、単結晶中性子回折により、基底状態及び磁場誘起秩序相の磁気構造について調べたので報告する。
