Lifting of nodes by disorder in extended-s state superconductors: application to ferropnictides
Abstract
We show, using a simple model, how ordinary disorder can gap an extended-s (A1g) symmetry superconducting state with nodes. The concommitant crossover of thermodynamic properties, particularly the T-dependence of the superfluid density, from pure power law behavior to an activated one is exhibited. We discuss applications of this scenario to experiments on the ferropnictide superconductors.
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