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

フラックス法で成長させたEuCuSi単結晶のスピングラス的振舞い

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*; 天児 寧*; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Takeuchi, Tetsuya*; Haga, Yoshinori; Taniguchi, Toshifumi*; Iha, Wataru*; Ashitomi, Yosuke*; Yara, Tomoyuki*; Kida, Takanori*; Tahara, Taimu*; Hagiwara, Masayuki*; Nakashima, Miho*; Amako, Yasushi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

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.