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
DOI 10.1103/PhysRevB.86.144515 · Physical Review B
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Abstract
We present a polarization-resolved study of the low-energy band structure in the optimally doped iron pnictide superconductor Ba0.6K0.4Fe2As2 (Tc=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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
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