Pairing in the iron arsenides: a functional RG treatment

Details Pairing in the iron arsenides: a functional RG treatment Pairing in the iron arsenides: a functional RG treatment

2009-03-11

arxiv.org/abs/0903.1963v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We study the phase diagram of a microscopic model for the superconducting iron arsenides by means of a functional renormalization group. Our treatment establishes a connection between a strongly simplified two-patch model by Chubukov et al. and a five-band- analysis by Wang et al.. For a wide parameter range, the dominant pairing instability occurs in the extended s-wave channel. The results clearly show the relevance of pair scattering between electron and hole pockets. We also give arguments that the phase transition between the antiferromagnetic phase for the undoped system and the superconducting phase may be first order.

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