Pairing State with a Time-Reversal Symmetry Breaking in FeAs-Based Superconductors

Wei-Cheng Lee, Shou-Cheng Zhang, and Congjun Wu
Phys. Rev. Lett. 102, 217002 – Published 26 May 2009

Abstract

We investigate the competition between the extended s±-wave and dx2y2-wave pairing order parameters in the iron-based superconductors. Because of the frustrating pairing interactions among the electron and the hole Fermi pockets, a time-reversal symmetry breaking s+id pairing state could be favored. We analyze this pairing state within the Ginzburg-Landau theory and explore the experimental consequences. In such a state, spatial inhomogeneity induces a supercurrent near a nonmagnetic impurity and the corners of a square sample. The resonance mode between the s±- and dx2y2-wave order parameters can be detected through the B1g Raman spectroscopy.

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  • Received 6 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.217002

©2009 American Physical Society

Authors & Affiliations

Wei-Cheng Lee1, Shou-Cheng Zhang2, and Congjun Wu1

  • 1Department of Physics, University of California, San Diego, California 92093, USA
  • 2Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA

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Issue

Vol. 102, Iss. 21 — 29 May 2009

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