Te concentration dependent photoemission and inverse-photoemission study of FeSe1-xTex

Takayoshi Yokoya, Rikiya Yoshida, Yuki Utsumi, Koji Tsubota, Hiroyuki Okazaki, Takanori Wakita, Yoshikazu Mizuguchi, Yoshihiko Takano, Takayuki Muro, Yukako Kato, Hiroshi Kumigashira, Masaharu Oshima, Hisatomo Harima, Yoshihiro Aiura, Hitoshi Sato, Akihiro Ino, Hirofumi Namatame, Masaki Taniguchi, Masaaki Hirai, Yuji Muraoka

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We have characterized the electronic structure of FeSe1-xTe x for various x values using soft x-ray photoemission spectroscopy (SXPES), high-resolution photoemission spectroscopy (HRPES) and inverse photoemission spectroscopy (IPES). The SXPES valence band spectral shape shows that the 2 eV feature in FeSe, which was ascribed to the lower Hubbard band in previous theoretical studies, becomes less prominent with increasing x. HRPES exhibits systematic x dependence of the structure near the Fermi level (E F): its splitting near EF and filling of the pseudogap in FeSe. IPES shows two features, near EF and approximately 6 eV above EF; the former may be related to the Fe 3d states hybridized with chalcogenide p states, while the latter may consist of plane-wave-like and Se d components. In the incident electron energy dependence of IPES, the density of states near EF for FeSe and FeTe has the Fano lineshape characteristic of resonant behavior. These compounds exhibit different resonance profiles, which may reflect the differences in their electronic structures. By combining the PES and IPES data the on-site Coulomb energy was estimated at 3.5 eV for FeSe.

    Original languageEnglish
    Article number054403
    JournalScience and Technology of Advanced Materials
    Volume13
    Issue number5
    DOIs
    Publication statusPublished - 2012 Oct 1

    Keywords

    • FeSe()Te
    • electronic structure
    • high-resolution photoemission spectroscopy
    • inverse photoemission spectroscopy
    • soft x-ray photoemission spectroscopy

    ASJC Scopus subject areas

    • Materials Science(all)

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  • Cite this

    Yokoya, T., Yoshida, R., Utsumi, Y., Tsubota, K., Okazaki, H., Wakita, T., Mizuguchi, Y., Takano, Y., Muro, T., Kato, Y., Kumigashira, H., Oshima, M., Harima, H., Aiura, Y., Sato, H., Ino, A., Namatame, H., Taniguchi, M., Hirai, M., & Muraoka, Y. (2012). Te concentration dependent photoemission and inverse-photoemission study of FeSe1-xTex. Science and Technology of Advanced Materials, 13(5), [054403]. https://doi.org/10.1088/1468-6996/13/5/054403