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

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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Category:Physics, Multidisciplinary

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