Uniform impurity scattering in two-band $s_{\pm }$ and $s_{++}$ superconductors

M. M. Korshunov, Yu. N. Togushova, O. V. Dolgov

The $s_{\pm }$ and $s_{++}$ models for the superconducting state are subject of intense studies regarding Fe-based superconductors. Depending on the parameters, disorder may leave int…