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※ 半角英数字
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Multipole order and fluctuation in Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$ studied by resonant X-ray diffraction

共鳴X線回折によるCe$$_{0.7}$$La$$_{0.3}$$B$$_6$$の多極子の秩序と揺らぎ

松村 武*; 道村 真司*; 稲見 俊哉; 大坪 亨*; 谷田 博司*; 伊賀 文俊*; 世良 正文*

Matsumura, Takeshi*; Michimura, Shinji*; Inami, Toshiya; Otsubo, Toru*; Tanida, Hiroshi*; Iga, Fumitoshi*; Sera, Masafumi*

Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$の1.5K以下の$$T_{beta}$$型反強八極子秩序相(AFO)を磁場中共鳴X線回折法で研究し、AFO相の磁場誘起の多極子を同定した。$$Gamma_8$$ 4重項結晶場基底状態における$$T_{beta}$$型AFO相に対する平均場近似では、$$O_{22}$$$$O_{20}$$が最も誘起される反強四極子と予想される。しかし、この予想に反して、主な誘起モーメントは$$O_{xy}$$型反強四極子と分かった。

We study the $$T_{beta}$$-type antiferro-octupole (AFO) ordered state of Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$ below 1.5 K by resonant X-ray diffraction in magnetic fields. Multipole moments induced by the field in the AFO phase are identified. In a mean-field model for the $$T_{beta}$$ AFO order within the $$Gamma_8$$ quartet crystal-field ground state, the $$O_{22}$$ and $$O_{20}$$ antiferroquadrupoles (AFQ) are expected as mostly induced AFQ. However, in contrast to this expectation, the main induced moment is found to be the $$O_{xy}$$-type AFQ.

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