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Neutron scattering study on U-dichalcogenides

Metoki, Naoto  ; Kaneko, Koji  ; Ikeda, Shugo*; Sakai, Hironori  ; Yamamoto, Etsuji ; Haga, Yoshinori ; Homma, Yoshiya*; Shiokawa, Yoshinobu*

Inelastic neutron scattering study has been carried out on US$$_{2}$$. A clear crystalline electric field (CEF) peak has been observed at 7.4 meV, which is consistent with the level scheme obtained from susceptibility data assuming 5f$$^{2}$$ configuration. The CEF becomes very weak and broad, and a quasi-elastic response emerges above the characteristic temperature $$sim$$100 K. It indicates the crossover of the 5f character between localized and itinerant. A quasi-elastic response can be concluded as the hybridization effect of the 5f electrons with ligand p-electrons. Our study suggests that the crossover of the 5f character is the origin of the metal-insulator transition in US$$_{2}$$.

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