Pairing State with a time-reversal symmetry breaking in FeAs based superconductors

Details Pairing State with a time-reversal symmetry breaking in FeAs based superconductors Pairing State with a time-reversal symmetry breaking in FeAs based superconductors

2008-10-06

arxiv.org/abs/0810.0887v3

Phys. Rev. Lett. 102, 217002 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, new references added

Scientific paper

10.1103/PhysRevLett.102.217002

We investigate the competition between the extended $s_{\pm}$-wave and $d_{x^2-y^2}$-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 supercurrent near a non-magnetic impurity and the corners of a square sample. The resonance mode between the $s_{\pm}$ and $d_{x^2-y^2}$-wave order parameters can be detected through the $B_{1g}$-Raman spectroscopy.

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