Impurity-Induced Virtual Bound States in d-Wave Superconductors
Condensed Matter
2009-10-22 v1
Abstract
It is shown that a single, strongly scattering impurity produces a bound or a virtual bound quasiparticle state inside the gap in a -wave superconductor. The explicit form of the bound state wave function is found to decay exponentially with angle-dependent range. These states provide a natural explanation of the second Cu NMR rate arising from the sites close to Zn impurities in the cuprates. Finally, for finite concentration of impurities in a -wave superconductor, we reexamine the growth of these states into an impurity band, and discuss the Mott criterion for this band.
Keywords
Cite
@article{arxiv.cond-mat/9407102,
title = {Impurity-Induced Virtual Bound States in d-Wave Superconductors},
author = {A. V. Balatsky and M. I. Salkola and A. Rosengren},
journal= {arXiv preprint arXiv:cond-mat/9407102},
year = {2009}
}
Comments
12 pages and 2 figures, RevTex, LA-UR-94-1944