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

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

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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 language	English (US)
Article number	144515
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.86.144515
State	Published - Oct 15 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.86.144515

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

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.",

author = "Wray, {L. A.} and R. Thomale and C. Platt and D. Hsieh and D. Qian and Chen, {G. F.} and Luo, {J. L.} and Wang, {N. L.} and Hasan, {M. Z.}",

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doi = "10.1103/PhysRevB.86.144515",

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AU - Wray, L. A.

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.

PY - 2012/10/15

Y1 - 2012/10/15

N2 - 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.

AB - 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.

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

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