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    Maiti, Saurabh.
    Gap Symmetry in KFe2As2 / S. Maiti, M. Korshunov, A. Chubukov // Bulletin of the American Physical Society. - 2012. - Vol. 57, № 1. - P. 316
Аннотация: We revisit the issue of the gap symmetry in KFe 2 As 2 , which is an Fe-pnictide superconductor with only hole pockets. Previous theoretical studies mostly argued for a d− wave gap in KFe 2 As 2 since transport and thermodynamic measurements point to the presence of the gap nodes. However, a d− wave gap is inconsistent with recent laser-based angle-resolved photoemission measurements. We propose the scenario for a nodal s− wave superconductivity induced by a non-magnetic intra-band and inter-band interactions between fermions near the two hole pockets at Γ point. The superconducting gap that we find changes sign between the two hole pockets at Γ point and has cos4θ angular dependence and can have accidental nodes on one or several hole pockets. We argue that strong angle dependence is the consequence of near-degeneracy between inter-pocket and intra-pocket interaction on the hole pockets. We also provide a connection between the the relative phase of 4θ oscillations and the shapes of the Fermi surface and discuss the implications in the light of photoemission and tunneling experiments.

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Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Chubukov, A.; APS March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA); American Physical Society March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA)
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