Conduction-band electronic states of YbInCu studied by photoemission and soft X-ray absorption spectroscopies

Utsumi, Yuki*; Sato, Hitoshi*; Kurihara, Hidenao*; Maso, Hiroyuki*; Hiraoka, Koichi*; Kojima, Kenichi*; Tobimatsu, Komei*; Okochi, Takuo*; Fujimori, Shinichi   ; Takeda, Yukiharu   ; Saito, Yuji  ; Mimura, Kojiro*; Ueda, Shigenori*; Yamashita, Yoshiyuki*; Yoshikawa, Hideki*; Kobayashi, Keisuke*; Oguchi, Tamio*; Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*

We have studied conduction-band (CB) electronic states of a typical valence-transition compound YbInCu by means of temperature-dependent hard X-ray photoemission spectroscopy (HX-PES), soft X-ray absorption spectroscopy (XAS), and soft X-ray photoemission spectroscopy (SX-PES) of the valence band. We have described the valence transition in YbInCu in terms of the charge transfer from the CB to Yb 4 states.