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Universal scaling behavior under pressure in the heavy-fermion antiferromagnet CeRh$$_2$$Si$$_2$$; $$^{29}$$Si NMR study

重い電子系反強磁性体における圧力下の普遍的スケーリング的振る舞いについて; $$^{29}$$Si核核磁気共鳴研究

酒井 宏典  ; 松本 裕司*; 芳賀 芳範 ; 徳永 陽 ; 神戸 振作 

Sakai, Hironori; Matsumoto, Yuji*; Haga, Yoshinori; Tokunaga, Yo; Kambe, Shinsaku

重い電子系反強磁性体CeRh$$_2$$Si$$_2$$において、$$^{29}$$Si核核磁気共鳴(NMR)を用いて、圧力下相図について微視的に調べた。NMRデータから、反強磁性伝搬ベクトル$$q$$に依らない単一サイト近藤効果の特徴的温度スケール$$T_0$$を導出した。圧力下の反強磁性臨界点において$$T_0$$の発散的異常は見られず、重い電子系の典型的なDoniach描像と矛盾しない結果が得られた。

The microscopic origin of a magnetic phase diagram under pressure in a heavy fermion antiferromagnet CeRh$$_2$$Si$$_2$$ was investigated using the $$^{29}$$Si nuclear magnetic resonance (NMR) technique. We investigated the temperature and pressure dependencies of $$q$$-independent local fluctuations caused by the single-site Kondo effect. A universal scaling behavior observed on the energy scale of the local fluctuations in an entire pressure region demonstrates that a characteristic energy scale $$T_0$$ of Kondo interactions monotonically increases by applying pressure without a critical anomaly around the quantum critical pressure $$P_{rm c}$$ of antiferromagnetism. Our NMR result agrees with the Doniach picture of the heavy-fermion phase diagram, where the progressive delocalization of the $$f$$-electrons occurs across $$P_{rm c}$$, accompanied by the development of antiferromagnetic correlations among the $$f$$-electrons.

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分野:Materials Science, Multidisciplinary

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