Impurity suppression of the critical temperature in the iron-based superconductors
Abstract
We study the impurity suppression of the critical temperature of the FeAs superconductors theoretically based on the the s-wave pairing state of a two band model. The effects of non-magnetic and magnetic impurities are studied with the -matrix approximation, which can continuously treat impurity scattering from weak to strong coupling limit. We found that both magnetic and non-magnetic impurities suppress with a rate that is practically indistinguishable from the standard d-wave case despite a possibly large difference of the positive and negative s-wave order parameter (OP) magnitudes. This is because the density of states enters together with the OP magnitude for the scattering process.
Cite
@article{arxiv.0808.3473,
title = {Impurity suppression of the critical temperature in the iron-based superconductors},
author = {Yunkyu Bang and Han-Yong Choi and Hyekyung Won},
journal= {arXiv preprint arXiv:0808.3473},
year = {2009}
}
Comments
4 pages, 3 figures, Refs updated. Combined version with arXiv:0808.0302 is published in PRB, but the separate short version is kept for readers