Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO(sub 1-x)Fx

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 super exchange 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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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 2008
Accession Number
AD1021827

Entities

People

  • D. J. Singh
  • I. I. Mazin
  • M. D. Johannes
  • M. H. Du

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Structures
  • Brillouin Zones
  • Couplings
  • Electrons
  • Energy Bands
  • Fermi Levels
  • Fermi Surfaces
  • Instability
  • Materials
  • Materials Science
  • Neutron Scattering
  • Phase Shift
  • Scattering
  • Solid State Physics
  • Superconductivity
  • Three Dimensional
  • Transitions

Fields of Study

  • Physics

Readers

  • Economics
  • Superconducting Magnet Technology