Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters

Details Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters

2009-06-15

arxiv.org/abs/0906.2639v1

J. Phys. Soc. Jpn. 78 (2009) 084718

Physics

Condensed Matter

Superconductivity

23 pages, 7 figures, to be published in J. Phys. Soc. Jpn. (2009) No. 8

Scientific paper

10.1143/JPSJ.78.084718

A single impurity problem is investigated for multiband s-wave superconductors with different sign order parameters (+-s-wave superconductors) suggested in Fe-pnictide superconductors. Not only intraband but also interband scattering is considered at the impurity. The latter gives rise to impurity-induced local boundstates close to the impurity. We present an exact form of the energy of the local boundstates as a function of strength of the two types of impurity scattering. The essential role of the impurity is unchanged in finite number of impurities. The main conclusions for a single impurity problem help us understand effects of dense impurities in the +-s-wave superconductors. Local density of states around the single impurity is also investigated. We suggest impurity site nuclear magnetic resonance as a suitable experiment to probe the local boundstates that is peculiar to the +-s-wave state. We find that the +-s-wave model is mapped to a chiral dx2-y2+-idxy-wave, reflecting the unconventional nature of the sign reversing order parameter. For a quantum magnetic impurity, interband scattering destabilizes the Kondo singlet.

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