Magnetic impurities in the two-band $s_{\pm }$-wave superconductors

Abstract

We investigate the effects of magnetic impurities in a superconducting state with $s_{\pm }$ pairing symmetry. Within a two-band model, we find that the intra-band magnetic scattering serves as a pair breaker while the inter-band magnetic scattering preserves pairing and hardly affects transition temperature in the Born limit. We also show that the same physics can persist beyond the weak scattering region. Our results coincide with recent experimental measurements in iron-based superconductors and thus provides an indirect evidence of the possible $s_{\pm }$ pairing symmetry in these materials.

arXiv comment5 pages,4 figures

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• Single Impurity Problem in Iron-Pnictide Superconductors
• Unexpected impact of magnetic disorder on multiband superconductivity
• Reentrant phases in electron-doped ${\text{EuFe}}_2{\text{As}}_2$: spin glass and superconductivity
• Impurity bound states and disorder-induced orbital and magnetic order in the s+- state of Fe-based superconductors
• Robust Zero Energy Bound States Localized at Magnetic Impurities in Iron-based Superconductors
• Effect of Impurities with Internal Structure on Multiband Superconductors - Possible Enhancement of Transition Temperature -
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• Microscopic evidence for Fulde-Ferrel-Larkin-Ovchinnikov state and multiband effects in KFe${}_2$As${}_2$