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Electronic structure of URu$$_2$$Si$$_2$$ in paramagnetic phase; Three-dimensional angle resolved photoelectron spectroscopy study

常磁性URu$$_2$$Si$$_2$$の電子状態; 3次元角度分解光電子分光研究

藤森 伸一  ; 竹田 幸治  ; 山上 浩志; 山本 悦嗣 ; 芳賀 芳範 

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

The three-dimensional (3D) electronic structure of the hidden order compound $$mathrm{URu_2Si_2}$$ 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 $$mathrm{U}~5f$$ state were observed near $$E_mathrm{F}$$, formed by the hybridization with the $$mathrm{Ru}~4d$$ states. The energy dispersion of the quasi-particle band is significantly depend on$$k_z$$, 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$$mathrm{URu_2Si_2}$$ is an essential ingredient for modeling its hidden-order transition.

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