Electronic structure of URuSi in paramagnetic phase; Three-dimensional angle resolved photoelectron spectroscopy study

Fujimori, Shinichi   ; Takeda, Yukiharu   ; Yamagami, Hiroshi; Yamamoto, Etsuji  ; Haga, Yoshinori   

The three-dimensional (3D) electronic structure of the hidden order compound in a paramagnetic phase was revealed using a 3D angle-resolved photoelectron spectroscopy where the electronic structure of the entire Brillouin zone is obtained by scanning both incident photon energy and detection angles of photoelectrons. The quasi-particle bands with enhanced contribution from the state were observed near , formed by the hybridization with the states. The energy dispersion of the quasi-particle band is significantly depend on, indicating that they inherently have a 3D nature. The band-structure calculation qualitatively explain the characteristic features of the band structure and Fermi surface although the electron correlation effect strongly renormalizes the quasi-particle bands. The 3D and strongly-correlated nature of the quasi-particle bands in is an essential ingredient for modeling its hidden-order transition.