Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides

Details Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides

2009-03-30

arxiv.org/abs/0903.5216v1

Phys. Rev. B 79, 224510 (2009)

Physics

Condensed Matter

Superconductivity

6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.79.224510

We discuss the large gap anisotropy found for the A1g (s-wave) state in RPA spin-fluctuation and functional renormalization group calculations and show how the simple arguments leading to isotropic sign-switched s-wave states in these systems need to be supplemented by a consideration of pair scattering within Fermi surface sheets and between the individual electron sheets as well. In addition, accounting for the orbital makeup of the states on the Fermi surface is found to be crucial.

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