Electronic structure of UTe; A Perspective from photoelectron spectroscopy

UTeの電子状態; 光電子分光からの視点

藤森 伸一   

Fujimori, Shinichi

The unconventional superconductors in -based materials attract much attention in recent years. Recently, it was discovered that UTe has relatively high transition temperature (=1.65 K), and it is classified into one of such class of materials. In the present study, the electronic structure of UTe was studied by resonant photoelectron spectroscopy (RPES) and angle-resolved photoelectron spectroscopy (ARPES) with soft X-ray synchrotron radiation. The partial U 5 density of states of UTe2 were imaged by the U 4-5 RPES and it was found that the U 5 state has an itinerant character, but there exists an incoherent peak due to the strong electron correlation effects. The band structure of UTe was obtained by ARPES and its overall band structure was mostly explained by band structure calculations, except for the incoherent band at 0.5 eV. These results suggest that the U 5 states of UTe have itinerant but strongly-correlated nature with enhanced hybridization with the Te 5 states.