Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit

Details Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit

2008-08-24

arxiv.org/abs/0808.3234v2

Phys. Rev. Lett. 102, 047006 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, submit to prl

Scientific paper

10.1103/PhysRevLett.102.047006

Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket. The inter-pocket pair scatterings determine the symmetry of the superconductivity, which is extended s-wave at small Hund's coupling, and d-wave at large Hund's coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscope.

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