Abstract
Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large 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 interpocket pair scatterings determine the symmetry of the superconductivity, which is extended wave at small Hund’s coupling, and wave at large Hund’s coupling and large . The former is consistent with recent experiments of angle-resolved photoemission spectroscopy and Andreev reflection spectroscopy.
- Received 8 September 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.047006
©2009 American Physical Society