Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides

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dc.creatorGraser, S.
dc.creatorMaier, T. A.
dc.creatorHirschfeld, P. J.
dc.creatorScalapino, D. J.
dc.date2008-12-01
dc.date2009-03-02
dc.date.accessioned2026-07-07T12:47:28Z
dc.date.available2026-07-07T12:47:28Z
dc.descriptionWeak-coupling approaches to the pairing problem in the iron pnictide superconductors have predicted a wide variety of superconducting ground states. We argue here that this is due both to the inadequacy of certain approximations to the effective low-energy band structure, and to the natural near-degeneracy of different pairing channels in superconductors with many distinct Fermi surface sheets. In particular, we review attempts to construct two-orbital effective band models, the argument for their fundamental inconsistency with the symmetry of these materials, and the comparison of the dynamical susceptibilities in two- and five-orbital models. We then present results for the magnetic properties, pairing interactions, and pairing instabilities within a five-orbital Random Phase Approximation model. We discuss the robustness of these results for different dopings, interaction strengths, and variations in band structure. Within the parameter space explored, an anisotropic, sign-changing s-wave state and a d_x2-y2 state are nearly degenerate, due to the near nesting of Fermi surface sheets.
dc.description17 pages, 23 figures
dc.identifierhttps://arxiv.org/abs/0812.0343
dc.identifierhttp://arxiv.org/abs/0812.0343
dc.identifierNew J. Phys. 11, 025016 (2009)
dc.identifierdoi:10.1088/1367-2630/11/2/025016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221732
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleNear-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
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