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Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO1xFx

I. I. Mazin, D. J. Singh, M. D. Johannes, and M. H. Du
Phys. Rev. Lett. 101, 057003 – Published 29 July 2008

Abstract

We argue that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound. This resulting state is an example of extended s-wave pairing with a sign reversal of the order parameter between different Fermi surface sheets. The main role of doping in this scenario is to lower the density of states and suppress the pair-breaking ferromagnetic fluctuations.

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  • Received 18 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.057003

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Authors & Affiliations

I. I. Mazin1, D. J. Singh2, M. D. Johannes1, and M. H. Du2

  • 1Code 6393, Naval Research Laboratory, Washington, D.C. 20375, USA
  • 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114, USA

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Issue

Vol. 101, Iss. 5 — 1 August 2008

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