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  • Letter
  • Open Access

Unconventional superconductivity mediated solely by isotropic electron-phonon interaction

Fabian Schrodi*, Peter M. Oppeneer†, and Alex Aperis‡

  • Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120 Uppsala, Sweden

  • *fabian.schrodi@physics.uu.se
  • †peter.oppeneer@physics.uu.se
  • ‡alex.aperis@physics.uu.se
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Phys. Rev. B 104, L140506 – Published 28 October, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L140506

Abstract

Unconventional superconductivity is commonly linked to electronic pairing mechanisms, since it is believed that the conventional electron-phonon interaction (EPI) cannot cause sign-changing superconducting gap symmetries. Here, we show that this common understanding needs to be revised when one considers a more elaborate theory of electron-phonon superconductivity beyond standard approximations. We self-consistently solve the full-bandwidth, anisotropic Eliashberg equations including vertex corrections beyond Migdal's approximation assuming the usual isotropic EPI for cuprate, Fe-based, and heavy-fermion superconductors with nested Fermi surfaces. In the case of the high-Tc cuprates we find a d-wave order parameter, as well as a nematic state upon increased doping. For Fe-based superconductors, we obtain s± gap symmetry, while for heavy-fermion CeCoIn5 we find unconventional d-wave pairing. These results provide a proof of concept that EPI cannot be excluded as a mediator of unconventional and of high-Tc superconductivity.

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Outline

Information

Phys. Rev. B 104, L140506– Published 28 October, 2021
  • Received 23 June 2021
  • Revised 7 September 2021
  • Accepted 18 October 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by Bibsam.

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