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Recent progress of soft X-ray photoelectron spectroscopy studies of uranium compounds

ウラン化合物に対する軟X線光電子分光の最近の発展

藤森 伸一; 竹田 幸治; 岡根 哲夫; 斎藤 祐児; 藤森 淳; 山上 浩志; 山本 悦嗣; 芳賀 芳範; 大貫 惇睦

Fujimori, Shinichi; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika

最近のウラン化合物に対する軟X線光電子分光実験をレビューする。軟X線領域ではバルク5f電子状態が得られるため、ウラン化合物の電子状態を理解するうえで重要な研究手段である。また軟X線角度分解光電子分光によってバルクの5f電子状態を反映したバンド構造とフェルミ面を得ることが可能となった。近年の分野の進展についてレビューをする。

Recent progresses in the soft X-ray photoelectron spectroscopy (PES) studies (hn $$>$$ 100 eV) for uranium compounds are briefly reviewed. The soft X-ray PES has enhanced sensitivities for the bulk U 5f electronic structure, which is essential to understand the unique physical properties of uranium compounds. In particular, the recent remarkable improvement in energy resolutions from an order of 1 eV to 100 meV made it possible to observe fine structures in Uf density of states. Furthermore, soft X-ray ARPES becomes available due to the increase of photon flux at beamlines in third generation synchrotron radiation facilities. The technique made it possible to observe bulk band structures and Fermi surfaces of uranium compounds and therefore, the results can be directly compared with theoretical models such as band-structure calculations. The core-level spectra of uranium compounds show a systematic behavior depending on their electronic structures, suggesting that they can be utilized to determine basic physical parameters such as the U 5f-ligand hybridizations or Coulomb interaction between U 5f electrons. It is shown that soft X-ray PES provides unique opportunities to understand the electronic structures of uranium compounds.

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パーセンタイル:82.59

分野:Spectroscopy

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