Unexpected impact of magnetic disorder on multiband superconductivity

Abstract

We analyze how the magnetic disorder affects the properties of the two-band $s_{\pm }$ and $s_{++}$ models, which are subject of hot discussions regarding iron-based superconductors and other multiband systems like MgB${}_2$. We show that there are several cases when the transition temperature $T_c$ is not fully suppressed by magnetic impurities in contrast to the Abrikosov-Gor'kov theory, but a saturation of $T_c$ takes place in the regime of strong disorder. These cases are: (1) the purely interband impurity scattering, (2) the unitary scattering limit. We show that in the former case the $s_{\pm }$ gap is preserved, while the $s_{++}$ state transforms into the $s_{\pm }$ state with increasing magnetic disorder. For the case (2), the gap structure remains intact.

arXiv comment5 pages, 4 figures

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• Decisive proofs of the $s_{\pm }\to s_{++}$ transition in the temperature dependence of the magnetic penetration depth
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