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Valence state in Ce-based heavy fermion compounds at high magnetic fields

Ce系重い電子系化合物の強磁場下価数状態

松田 康弘*; Her, J.-L.*; 道村 真司*; 稲見 俊哉; 海老原 孝雄*; 網塚 浩*

Matsuda, Yasuhiro*; Her, J.-L.*; Michimura, Shinji*; Inami, Toshiya; Ebihara, Takao*; Amitsuka, Hiroshi*

CeRh$$_2$$Si$$_2$$の放射光X線吸収実験を32Tまでのパルス強磁場下で行った。Ceの価数は5Kで3+よりわずかに大きく、20T以上の磁場印加に伴い減少する。磁場誘起の価数変化は磁化過程のメタ磁性転移に対応している。この現象は我々の以前に行ったCeRu$$_2$$Si$$_2$$の結果に似ており、Ce系重い電子系化合物に共通の現象と思われる。

Synchrotron X-ray absorption spectroscopy of CeRh$$_2$$Si$$_2$$ has been performed in pulsed high magnetic fields of up to 32 T. The Ce valence is slightly larger than 3+ at 5 K and decreases with increasing magnetic above 20 T. The field-induced valence change seems to correspond to the metamagnetic transition in the magnetization process. This phenomena is similar to our previous result on CeRu$$_2$$Si$$_2$$ and seems to be common in Ce-based heavy fermion compounds.

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