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

    Fingerprint

    Group 5A compounds
    Local density approximation
    Band structure
    Superconducting materials
    Iron
    iron
    energy bands
    symmetry
    approximation
    interactions
    polarization
    Polarization
    Electrons
    electrons
    photoelectric emission
    Photoelectron spectroscopy
    anomalies
    deviation
    momentum
    Momentum

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Deviating band symmetries and many-body interactions in a model hole-doped iron pnictide superconductor. / Wray, L. A.; Thomale, R.; Platt, C.; Hsieh, D.; Qian, D.; Chen, G. F.; Luo, J. L.; Wang, N. L.; Hasan, M. Z.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 14, 144515, 15.10.2012.

    Research output: Contribution to journalArticle

    Wray, L. A. ; Thomale, R. ; Platt, C. ; Hsieh, D. ; Qian, D. ; Chen, G. F. ; Luo, J. L. ; Wang, N. L. ; Hasan, M. Z. / Deviating band symmetries and many-body interactions in a model hole-doped iron pnictide superconductor. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 14.
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    AU - Thomale, R.

    AU - Platt, C.

    AU - Hsieh, D.

    AU - Qian, D.

    AU - Chen, G. F.

    AU - Luo, J. L.

    AU - Wang, N. L.

    AU - Hasan, M. Z.

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