Deviating band symmetries and many-body interactions in a model hole-doped iron pnictide superconductor

L. A. Wray, R. Thomale, C. Platt, D. Hsieh, D. Qian, G. F. Chen, J. L. Luo, N. L. Wang, M. Z. Hasan

    Research output: Contribution to journalArticle

    Abstract

    We present a polarization-resolved study of the low-energy band structure in the optimally doped iron pnictide superconductor Ba 0.6K 0.4Fe 2As 2 (T c=37 K) using angle-resolved photoemission spectroscopy. Polarization-contrasted measurements are used to identify and trace all three low-energy holelike bands predicted by local density approximation (LDA) calculations. The photoemitted electrons reveal an inconsistency with LDA-predicted symmetries along the Γ-X high-symmetry momentum axis, due to unexpectedly strong rotational anisotropy in electron kinetics. We evaluate many-body effects such as Mott-Hubbard interactions, which are likely to underlie the anomaly, and discuss how the observed deviations from LDA band structure affect the energetics of iron pnictide Cooper pairing in the hole-doped regime.

    Original languageEnglish (US)
    Article number144515
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number14
    DOIs
    StatePublished - Oct 15 2012

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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    Wray, L. A., Thomale, R., Platt, C., Hsieh, D., Qian, D., Chen, G. F., Luo, J. L., Wang, N. L., & Hasan, M. Z. (2012). Deviating band symmetries and many-body interactions in a model hole-doped iron pnictide superconductor. Physical Review B - Condensed Matter and Materials Physics, 86(14), [144515]. https://doi.org/10.1103/PhysRevB.86.144515