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4$$f$$-derived Fermi surfaces of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ near the quantum critical point; Resonant soft-X-ray ARPES study

量子臨界点近傍でのCeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$の4$$f$$電子に起因するフェルミ面の研究; 共鳴軟X線ARPES実験

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

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

Angle-resolved photoelectron spectroscopy in the Ce $$3d$$$$rightarrow$$4$$f$$ excitation region was measured for the paramagnetic state of CeRu$$_2$$Si$$_2$$, CeRu$$_2$$(Si$$_{0.82}$$Ge$$_{0.18}$$)$$_2$$, and LaRu$$_2$$Si$$_2$$ to investigate the changes of the 4$$f$$ electron Fermi surfaces around the quantum critical point. While the difference of the Fermi surfaces between CeRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$ was experimentally confirmed, a strong 4$$f$$-electron character was observed in the band structures and the Fermi surfaces of CeRu$$_2$$Si$$_2$$ and CeRu$$_2$$(Si$$_{0.82}$$Ge$$_{0.18}$$)$$_2$$, consequently indicating a delocalized nature of the 4$$f$$ electrons in both compounds. The absence of Fermi surface reconstruction across the critical composition suggests that SDW quantum criticality is more appropriate than local quantum criticality in CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$.

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パーセンタイル:77.18

分野:Physics, Multidisciplinary

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