Volume 88, Number 1, October 2009
Article Number 17009
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 26 October 2009
EPL, 88 (2009) 17009
DOI: 10.1209/0295-5075/88/17009

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

Jian 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$_{\pm}$ 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.

74.20.-z - Theories and models of superconducting state.
74.62.Dh - Effects of crystal defects, doping and substitution.

© EPLA 2009