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Resonant angle-resolved photoelectron spectroscopy of substitutional solid solutions of CeRu$$_2$$Si$$_2$$

CeRu$$_2$$Si$$_2$$混晶化合物の共鳴角度分解光電子分光

岡根 哲夫; 川崎 郁斗; 保井 晃; 大河内 拓雄*; 竹田 幸治; 藤森 伸一; 斎藤 祐児; 山上 浩志; 藤森 淳; 松本 裕司*; 木村 憲彰*; 小松原 武美*; 青木 晴善*

Okane, Tetsuo; Kawasaki, Ikuto; Yasui, Akira; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

Angle-resolved photoelectron spectroscopy was measured in the Ce 3$$d$$$$rightarrow$$4$$f$$ resonance energy region for the paramagnetic state of CeRu$$_2$$Si$$_2$$, Ce$$_{0.84}$$La$$_{0.16}$$Ru$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$ to investigate a variation of band structures around the quantum critical point (QCP). While the results clearly demonstrate the difference of the band structures between CeRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$, the observed band structures of CeRu$$_2$$Si$$_2$$ and Ce$$_{0.84}$$La$$_{0.16}$$Ru$$_2$$Si$$_2$$ resemble each other. The results indicate that the Ce $$4f$$ electrons in the paramagnetic state have an itinerant character in either side of the critical composition, and Ce$$_{1-x}$$La$$_{x}$$Ru$$_2$$Si$$_2$$ near QCP is similar to CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$.

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パーセンタイル:87.43

分野:Physics, Multidisciplinary

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