Singular current response from isolated impurities in d-wave superconductors
arXiv:cond-mat/0203330 · doi:10.1103/PhysRevLett.89.147004
Abstract
The current response of a d-wave superconductor containing a single impurity is calculated and shown to be singular in the low-temperature limit, leading in the case of strong scattering to a 1/T term in the penetration depth $λ(T)$ similar to that induced by Andreev surface bound states. For a small number of such impurities, we argue this low-$T$ upturn could be observable in cuprate superconductors.
4 pages, 2 .eps figures. Minor changes to match the published version