Deviating band symmetries and many-body interactions in a model hole-doped iron pnictide superconductor
Name
Wray-2012-Deviating band symmetries and many-body interactions.pdf
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1.42 MB
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Checksum (MD5)
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Author(s)
Hsieh, David
Wray, L. A.
Thomale, R.
Platt, C.
Qian, D.
Chen, G. F.
Luo, J. L.
Wang, N. L.
Hasan, M. Z.
Date Issued
October 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Wray, L. et al. “Deviating Band Symmetries and Many-body Interactions in a Model Hole-doped Iron Pnictide Superconductor.” Physical Review B 86.14 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We present a polarization-resolved study of the low-energy band structure in the optimally doped iron pnictide superconductor Ba[subscript 0.6]K[subscript 0.4]Fe[subscript 2]As[subscript 2] (T[subscript 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.86.144515
