We show, using a simple model, how ordinary disorder can gap an extended-s- (A1g) symmetry superconducting state with nodes. The concomitant 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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Mishra et al. (2009) studied this question.
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