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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

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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Category:Physics, Multidisciplinary

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