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Soft X-ray angle resolved photoemission study of superconducting and magnetic uranium compounds

Fujimori, Shinichi   ; Okochi, Takuo; Okane, Tetsuo  ; Saito, Yuji  ; Fujimori, Atsushi; Yamagami, Hiroshi; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori  ; Yamamoto, Etsuji  ; Onuki, Yoshichika*

Angle resolved photoemission spectroscopy in soft X-ray (SX-ARPES) has been recognized as a powerful experimental tool to reveal electronic structures of strongly correlated materials. Meanwhile, although actinide compounds attract much attention in recent years due to their exotic superconducting and magnetic properties, their electronic structures are not well understood. Since SX-ARPES can probe bulk U 5f electronic structures, it is possible to explore the mechanism of superconductivity or magnetism in actinide compounds. In the present study, we show recent results of SX-ARPES studies on superconducting and magnetic uranium compounds. Experiments were performed at the soft X-ray beamline SPring-8 BL23SU. We have clearly observed energy band dispersion and Fermi surface of U 5f origin in these compounds. The obtained data are compared with theoretical models, and the mechanisms of superconductivity and magnetism in uranium compounds are discussed.

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