Anisotropic pairing in the iron pnictides

Details Anisotropic pairing in the iron pnictides Anisotropic pairing in the iron pnictides

2008-07-29

arxiv.org/abs/0807.4566v2

Phys. Rev. B 79, 054511 (2009)

Physics

Condensed Matter

Superconductivity

Revised and substantially extended version, accepted for publication in Phys. Rev. B; 9 pages, 6 figures

Scientific paper

We determine the anisotropy of the spin fluctuation induced pairing gap on the Fermi surface of the FeAs based superconductors as function of the exchange and Hund's coupling $J_{H}$. We find that for sufficiently large $J_{H}$, nearly commensurate magnetic fluctuations yield a fully gapped $s^{\pm}$-pairing state with small anisotropy of the gap amplitude on each Fermi surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi surface sheets, as seen in ARPES experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an $s^{\pm}$-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three dimensional effects come into play.

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