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

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

2009-05-24

arxiv.org/abs/0905.3883v2

EPL 88 (2009) 17009

Physics

Condensed Matter

Superconductivity

5 pages,4 figures

Scientific paper

10.1209/0295-5075/88/17009

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.

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