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Soft X-ray synchrotron radiation photoemission study on uranium compounds

軟X線放射光光電子分光法によるウラン化合物の研究

藤森 伸一; 寺井 恒太; 竹田 幸治; 岡根 哲夫; 斎藤 祐児; 村松 康司; 藤森 淳; 山上 浩志*; 池田 修悟; 松田 達磨; 常盤 欣文*; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦

Fujimori, Shinichi; Terai, Kota; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Muramatsu, Yasuji; Fujimori, Atsushi; Yamagami, Hiroshi*; Ikeda, Shugo; Matsuda, Tatsuma; Tokiwa, Yoshifumi*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

現在、その高いバルク敏感性から、軟X線を用いた光電子分光実験が注目を集めている。われわれはSPring-8からの軟X線放射光を用いてウラン化合物に対する放射光光電子分光実験を行った。遍歴的なウラン化合物UFeGa$$_5$$とUSb$$_2$$のバンド構造及びフェルミ面の導出を行い、バンド計算との比較を行った。また、重い電子系化合物UPd$$_2$$Al$$_3$$, UNi$$_2$$Al$$_3$$に対する実験も行った。UPd$$_2$$Al$$_3$$では、U 5$$f$$電子状態の温度変化が観測された。

Recently, photoemission experiments in soft X-ray region have attracted much attention due to their high sensitivities for bulk electronic structures of strongly correlated electron system. We have carried out the high-resolution photoemission experiments on some uranium compounds using soft X-ray synchrotron radiation from SPring-8 to understand their electronic structures. Bulk- and U 5$$f$$-sensitive band structure and Fermi surface were obtained for itinerant U 5$$f$$ compounds UFeGa$$_5$$ and USb$$_2$$, and they are compared with the results of the band structure calculations treating U 5$$f$$ states as being itinerant. In addition, we show the results of photoemission study on some heavy fermion compounds such as UPd$$_2$$Al$$_3$$ and UNi$$_2$$Al$$_3$$. The temperature dependences of the U 5$$f$$ electronic structure of UPd$$_2$$Al$$_3$$ will be also reported.

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パーセンタイル:86.27

分野:Physics, Condensed Matter

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