Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit
Superconductivity
2009-02-02 v2
Abstract
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.
Keywords
Cite
@article{arxiv.0808.3234,
title = {Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit},
author = {Wei-Qiang Chen and Kai-Yu Yang and Yi Zhou and Fu-Chun Zhang},
journal= {arXiv preprint arXiv:0808.3234},
year = {2009}
}
Comments
4 pages, 4 figures, submit to prl