Electron correlation in the FeSe superconductor studied by bulk-sensitive photoemission spectroscopy

A. Yamasaki, Y. Matsui, S. Imada, K. Takase, H. Azuma, T. Muro, Y. Kato, A. Higashiya, A. Sekiyama, S. Suga, M. Yabashi, K. Tamasaku, T. Ishikawa, K. Terashima, H. Kobori, A. Sugimura, N. Umeyama, H. Sato, Y. Hara, N. MiyagawaS. I. Ikeda

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Abstract

We have investigated the electronic structures of recently discovered superconductor FeSe by soft-x-ray and hard-x-ray photoemission spectroscopy with high-bulk sensitivity. The large Fe3d spectral weight is located in the vicinity of the Fermi level (EF), which is demonstrated to be a coherent quasiparticle peak. Compared with the results of the band-structure calculation with local-density approximation, Fe3d band narrowing and the energy shift of the band toward EF are found, suggesting an importance of the electron correlation effect in FeSe. The self-energy correction provides the larger mass enhancement value (Z-1 ≃3.6) than in Fe-As superconductors and enables us to separate an incoherent part from the spectrum. These features are quite consistent with the results of recent dynamical mean-field calculations, in which the incoherent part is attributed to the lower Hubbard band.

Original languageEnglish
Article number184511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number18
DOIs
Publication statusPublished - 8 Nov 2010

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    Yamasaki, A., Matsui, Y., Imada, S., Takase, K., Azuma, H., Muro, T., Kato, Y., Higashiya, A., Sekiyama, A., Suga, S., Yabashi, M., Tamasaku, K., Ishikawa, T., Terashima, K., Kobori, H., Sugimura, A., Umeyama, N., Sato, H., Hara, Y., ... Ikeda, S. I. (2010). Electron correlation in the FeSe superconductor studied by bulk-sensitive photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 82(18), [184511]. https://doi.org/10.1103/PhysRevB.82.184511