Resonant angle-resolved photoelectron spectroscopy of substitutional solid solutions of CeRuSi

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 34 resonance energy region for the paramagnetic state of CeRuSi, CeLaRuSi and LaRuSi 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 CeRuSi and LaRuSi, the observed band structures of CeRuSi and CeLaRuSi resemble each other. The results indicate that the Ce electrons in the paramagnetic state have an itinerant character in either side of the critical composition, and CeLaRuSi near QCP is similar to CeRu(SiGe).