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Electronic structure of Yb-based compounds studied by soft X-ray angle-resolved photoemission spectroscopy

軟X線角度分解光電子分光を用いたYb化合物の電子構造研究

保井 晃; 藤森 伸一   ; 川崎 郁斗  ; 岡根 哲夫  ; 竹田 幸治   ; 斎藤 祐児  ; 関山 明*; 摂待 力生*; Lapertot, G.*; Knebel, G.*; 松田 達磨; 芳賀 芳範   ; 山上 浩志; 大貫 惇睦*

Yasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Sekiyama, Akira*; Settai, Rikio*; Lapertot, G.*; Knebel, G.*; Matsuda, Tatsuma; Haga, Yoshinori; Yamagami, Hiroshi; Onuki, Yoshichika*

We have performed SX-ARPES measurements to investigate 3D valence-band dispersions in the bulk state of YbCu$$_2$$Ge$$_2$$, YbCu$$_2$$Si$$_2$$, and YbRh$$_2$$Si$$_2$$. It had been thought that YbCu$$_2$$Ge$$_2$$ is an Yb divalent compound. On the contrary, our SX-ARPES study of YbCu$$_2$$Ge$$_2$$ clarified that Yb 4$$f$$ electrons contribute to the formation of FSs through the hybridization with conduction bands, as observed in the typical valence fluctuating compound YbCu$$_2$$Si$$_2$$. The 3D band structures of YbCu$$_2$$Ge$$_2$$ can be reasonably explained by a relativistic LDA calculation, while those of YbCu$$_2$$Si$$_2$$ and the nearly trivalent compound YbRh$$_2$$Si$$_2$$ cannot be explained by it. Especially the relativistic LDA calculation of LuRh$$_2$$Si$$_2$$ can describe the observed band dispersions of YbRh$$_2$$Si$$_2$$ rather than that of YbRh$$_2$$Si$$_2$$. In the presentation, we will discuss the valence band structures obtained by the SX-ARPES measurements in term of the Yb valence systematically.

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