Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors

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dc.creatorYao, Zi-Jian
dc.creatorLi, Jian-Xin
dc.creatorWang, Z. D.
dc.date2008-04-25
dc.date2008-12-13
dc.date.accessioned2026-07-07T12:46:54Z
dc.date.available2026-07-07T12:46:54Z
dc.descriptionBased on an effective two-band model and using the fluctuation-exchange (FLEX) approach, we explore spin fluctuations and unconventional superconducting pairing in Fe-based layer superconductors. It is elaborated that one type of interband antiferromagnetic (AF) spin fluctuation stems from the interband Coulomb repulsion, while the other type of intraband AF spin fluctuation originates from the intraband Coulomb repulsion. Due to the Fermi-surface topology, a spin-singlet extended s-wave superconducting state is more favorable than the nodal $d_{XY}$-wave state if the interband AF spin fluctuation is more significant than the intraband one, otherwise vice versa. It is also revealed that the effective interband coupling plays an important role in the intraband pairings, which is a distinct feature of the present two-band system.
dc.description4 pages, 4 figures, to appear in New Journal of Physics focus issue on iron-based superconductors
dc.identifierhttps://arxiv.org/abs/0804.4166
dc.identifierhttp://arxiv.org/abs/0804.4166
dc.identifierNew J. Phys. 11, 025009 (2009)
dc.identifierdoi:10.1088/1367-2630/11/2/025009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221540
dc.subjectSuperconductivity
dc.titleSpin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
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