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Itinerancy and Electron Correlation in FeSe 1-x Superconductor Studied by Bulk-Sensitive Photoemission Spectroscopy

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arxiv 0902.3314 v3 pith:AGB6RBBN submitted 2009-02-19 cond-mat.supr-con

A. Yamasaki , S. Imada , K. Takase , T. Muro , Y. Kato , H. Kobori , A. Sugimura , N. Umeyama
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H. Sato Y. Hara N. Miyakawa S. I. Ikeda
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classification cond-mat.supr-con
keywords bandbulk-sensitivecorrelationelectronphotoemissionspectroscopysuperconductortoward
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We have investigated the electronic structures of newly discovered superconductor FeSe1-x by bulk-sensitive photoemission spectroscopy (PES). The large Fe 3d spectral weight is located in the vicinity of the Fermi level (EF) and it decreases steeply toward EF . Compared with results of band structure calculations, narrowing the Fe 3d band width and the energy shift of the band toward EF are found, suggesting a mass enhancement due to the weak electron correlation effect. Meanwhile, Fe 2p core-level PES reveals a strong itinerant character of Fe 3d electrons. These features are very similar to those in other Fe-based high-Tc superconductors.

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