Spin polarized neutron scattering study on metal-insulator crossover in uranium dichalcogenide -US

Metoki, Naoto   ; Sakai, Hironori   ; Suzuki, Michito; Yamamoto, Etsuji  ; Haga, Yoshinori   ; Matsuda, Tatsuma; Ikeda, Shugo*

Uranium chalcogenides are highly interesting because of the variety of the physical properties from 5-based metal and Mott-Hibbard insulator. Especially dichalcogenide family exhibits a metal-insulator crossover depending on the chalcogenide elements, or under magnetic field and pressure. In this talk we present a recent result of our neutron scattering study on uranium dichalcogenide, which demonstrates that the metal-insulator crossover is related to the change of 5 character from localized to itinerant. The electronic structure related to this phenomenon is discussed based on the band calculation.