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Electronic structure of UTe$$_2$$ studied by photoelectron spectroscopy

光電子分光によるUTe$$_2$$の電子状態

藤森 伸一; 川崎 郁斗; 竹田 幸治; 山上 浩志; 仲村 愛*; 本間 佳哉*; 青木 大*

Fujimori, Shinichi; Kawasaki, Ikuto; Takeda, Yukiharu; Yamagami, Hiroshi; Nakamura, Ai*; Homma, Yoshiya*; Aoki, Dai*

The electronic structure of the unconventional superconductor $$mathrm{UTe_2}$$ was studied by resonant photoelectron spectroscopy (RPES) and angle-resolved photoelectron spectroscopy (ARPES) with soft X-ray synchrotron radiation. The partial $$mathrm{U}~5f$$ density of states of $$mathrm{UTe_2}$$ were imaged by the $$mathrm{U}~4d$$ - $$5f$$ RPES and it was found that the $$mathrm{U}~5f$$ state has an itinerant character, but there exists an incoherent peak due to the strong electron correlation effects. Furthermore, an anomalous admixture of the $$mathrm{U}~5f$$ states into the $$mathrm{Te}~5p$$ bands was observed at a higher binding energy, which cannot be explained by band structure calculations. On the other hand, the band structure of $$mathrm{UTe_2}$$ was obtained by ARPES and its overall band structure were mostly explained by band structure calculations. These results suggest that the $$mathrm{U}~5f$$ states of $$mathrm{UTe_2}$$ have itinerant but strongly-correlated nature with enhanced hybridization with the $$mathrm{Te}~5p$$ states.

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