Penetration depth and impurity scattering in unconventional superconductors:<i>T</i>=0 results

Abstract

The behavior of the penetration depth \ensuremath{\lambda} at low temperatures is an important probe of the symmetry of the order parameter in superconductors. For this reason, the penetration depth in the high-${\mathit{T}}_{\mathit{c}}$ oxide has been the focus of much recent experimental and theoretical attention. In this paper we provide detailed results for the behavior of \ensuremath{\lambda} at T=0, as a function of impurity scattering, for an unconventional order parameter.