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Evidence for hidden quadrupolar fluctuations behind the octupole order in Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$ from resonant X-ray diffraction in magnetic fields

磁場中共鳴X線回折によるCe$$_{0.7}$$La$$_{0.3}$$B$$_6$$の八極子秩序相の背後に隠れた四極子揺らぎの証拠

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$$_6$$の多極子秩序相(IV相)を磁場中共鳴X線回折法で研究した。入射X線の直線偏光を回転するダイアモンド移相子と結晶アナライザを用いることにより全偏光解析を行い、磁場中の秩序変数を同定した。解析結果は、$$Gamma_{rm 5g}$$四極子が$$Gamma_{rm 3g}$$より磁場によってより誘起されることを示しており、これは$$Gamma_{rm 3g}$$が主要な誘起秩序変数であるとする平均場計算の結果と一致しない。したがって、我々は、$$Gamma_{rm 5g}$$四極子の大きな揺らぎが八極子秩序の背後に隠れていると考えている。

The multipole ordered phase in Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$ (phase IV) has been studied by resonant X-ray diffraction in magnetic fields. By utilizing diamond X-ray phase plates to rotate the incident linear polarization and a conventional crystal analyzer system, full linear polarization analysis has been performed to identify the order parameters. The analysis shows that the $$Gamma_{rm 5g}$$ quadrupoles are more induced by the field than the $$Gamma_{rm 3g}$$ quadrupoles in phase IV, in disagreement with mean-field calculations, in which the $$Gamma_{rm 3g}$$ quadrupole is the main induced moment. Hence, we consider that large fluctuations of the $$Gamma_{rm 5g}$$ quadrupole is hidden behind the primary ordering of the octupole.

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パーセンタイル:49.27

分野:Materials Science, Multidisciplinary

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