Abstract
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 d x 2 - y 2 ±i d x y -wave, reflecting the unconv...
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