Magnetic impurities in the two-band s-wave superconductorsJian Li and Yupeng Wang
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
received 25 August 2009; accepted in final form 28 September 2009; published October 2009
published online 26 October 2009
We investigate the effects of magnetic impurities in a superconducting state with s 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 pairing symmetry in these materials.
74.20.-z - Theories and models of superconducting state.
74.62.Dh - Effects of crystal defects, doping and substitution.
© EPLA 2009