Soft X-ray synchrotron radiation photoemission study on uranium compounds

Fujimori, Shinichi   ; Terai, Kota; Takeda, Yukiharu   ; Okane, Tetsuo  ; Saito, Yuji  ; Muramatsu, Yasuji; Fujimori, Atsushi; Yamagami, Hiroshi*; Ikeda, Shugo; Matsuda, Tatsuma; Tokiwa, Yoshifumi*; Haga, Yoshinori   ; Yamamoto, Etsuji  ; Onuki, Yoshichika

Recently, photoemission experiments in soft X-ray region have attracted much attention due to their high sensitivities for bulk electronic structures of strongly correlated electron system. We have carried out the high-resolution photoemission experiments on some uranium compounds using soft X-ray synchrotron radiation from SPring-8 to understand their electronic structures. Bulk- and U 5-sensitive band structure and Fermi surface were obtained for itinerant U 5 compounds UFeGa and USb, and they are compared with the results of the band structure calculations treating U 5 states as being itinerant. In addition, we show the results of photoemission study on some heavy fermion compounds such as UPdAl and UNiAl. The temperature dependences of the U 5 electronic structure of UPdAl will be also reported.