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Pairing in the iron arsenides: a functional RG treatment

Christian Platt, Carsten Honerkamp, Werner Hanke
2009 New Journal of Physics  
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
more » ... lso give arguments that the phase transition between the antiferromagnetic phase for the undoped system and the superconducting phase may be first order.
doi:10.1088/1367-2630/11/5/055058 fatcat:o3wausxzczhzrl4kjsidw4xrsy