Suppression of superconductivity by spin fluctuations in iron-based superconductors

Abstract

We study the superconducting instability mediated by spin fluctuations in the Eliashberg theory for a minimal two-band model of iron-based superconductors. While antiferromagnetic spin fluctuations can drive superconductivity (SC) as is well established, we find that spin fluctuations necessarily contain a contribution to suppress SC even though SC can eventually occur at lower temperatures. This self-restraint effect stems from a general feature of the spin-fluctuation mechanism, namely the repulsive pairing interaction, which leads to phase frustration of the pairing gap and consequently the suppression of SC.

arXiv comment13 pages, 5 figures

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• Doping dependence and multichannel mediators of superconductivity: Calculations for a cuprate model
• Unconventional superconductivity mediated solely by isotropic electron-phonon interaction
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors