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論文

Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu and EuAu with the characteristic hexagonal structure

松田進弥*; 太田譲二*; 仲井間憲李*; 伊覇航*; 郷地順*; 上床美也*; 中島美帆*; 天児寧*; 本多史憲*; 青木大*; et al.

Philosophical Magazine, 100(10), p.1244 - 1257, 2020/04

https://doi.org/10.1080/14786435.2019.1708498

被引用回数：3 パーセンタイル：19.14(Materials Science, Multidisciplinary)

Single crystal samples of EuCu and EuAu have been successfully prepared. Using those samples, magnetic and electronic anisotropy has been clarified. Magnetic moment in the ferromagnetic state points to the hexagonal -axis for both compounds. Electronic anisotropy was found in both electrical resistivity and Fermi surface topology. These anisotropic characteristics are accounted for by the unique hexagonal structure.

論文

Spin glass behavior in EuCuSi single crystal grown by the flux method

竹内徹也*; 芳賀芳範; 谷口年史*; 伊覇航*; 安次富洋介*; 屋良朝之*; 木田孝則*; 田原大夢*; 萩原政幸*; 中島美帆*; et al.

Journal of the Physical Society of Japan, 89(3), p.034705_1 - 034705_15, 2020/03

https://doi.org/10.7566/JPSJ.89.034705

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

Single crystals of EuCuSi have been grown by the flux method and Bridgman method. The Eu ions of the Bridgman-grown crystal are nearly trivalent and fluctuate depending on the temperature. On the other hand, the Eu ions of flux-grown sample are divalent and thermally stable and show spin-glass behavior at low temperatures. Crystallographic analyses identified random replacement of Cu sites by Si only for the flux-grown samples. Such structural randomness leads to spin-glass features.

論文

Single crystal growth and unique electronic states of cubic chiral EuPtSi and related compounds

大貫惇睦*; 垣花将司*; 伊覇航*; 仲井間憲李*; 青木大*; 仲村愛*; 本多史憲*; 中島美帆*; 天児寧*; 郷地順*; et al.

JPS Conference Proceedings (Internet), 29, p.012001_1 - 012001_9, 2020/02

https://doi.org/10.7566/JPSCP.29.012001

EuPtSi with the cubic chiral structure exhibits a skyrmion phase under magnetic field. We succeeded in growing high-quality single crystals by the Bridgman method. Fermi surface splitting reflecting the noncentrosymmetric structure was successfully observed experimentally.

論文

Anomalous ferromagnetic ordering in EuCuP

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

https://doi.org/10.1016/j.jallcom.2019.02.213

被引用回数：6 パーセンタイル：33.47(Chemistry, Physical)

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.