Electronic structure of UGa studied by angle-resolved photoelectron spectroscopy

Fujimori, Shinichi   ; Kobata, Masaaki  ; Takeda, Yukiharu   ; Okane, Tetsuo  ; Saito, Yuji  ; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori   ; Yamamoto, Etsuji  ; Onuki, Yoshichika*

The electronic structure of an itinerant antiferromagnet UGa has been studied by the means of angle resolved photoelectron spectroscopy (ARPES). UGa is an antiferromagnet with = 67 K, and it is considered as one of prototypical metallic uranium compounds. Although there are many studies on this compound, its detailed electronic structure has not been well understood. We have experimentally derived both of the band structure and Fermi surface of UGa, and found that U 5f states form quasi-particle bands near the Fermi energy. Furthermore, changes of the electronic structure due to the antiferromagnetic transition were studied by changing sample temperatures.