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

4 Scopus citations

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

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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