Andreev states near short-ranged pairing potential impurities
Superconductivity
2009-11-11 v1 Strongly Correlated Electrons
Abstract
We study Andreev states near atomic scale modulations in the pairing potential in both - and d-wave superconductors with short coherence lengths. For a moderate reduction of the local gap, the states exist only close to the gap edge. If one allows for local sign changes of the order parameter, however, resonances can occur at energies close to the Fermi level. The local density of states (LDOS) around such pairing potential defects strongly resembles the patterns observed by tunneling measurements around Zn impurities in BiSrCaCuO (BSCCO). We discuss how this phase impurity model of the Zn LDOS pattern can be distinguished from other proposals experimentally.
Cite
@article{arxiv.cond-mat/0507661,
title = {Andreev states near short-ranged pairing potential impurities},
author = {Brian M. Andersen and Ashot Melikyan and Tamara S. Nunner and P. J. Hirschfeld},
journal= {arXiv preprint arXiv:cond-mat/0507661},
year = {2009}
}
Comments
4 pages, 4 figures