'Pi State' Induced by Impurities with a Repulsive Interaction
Superconductivity
2009-11-10 v1 Disordered Systems and Neural Networks
Abstract
We study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a repulsive interaction to the system. We discuss the influence of this `on-impurity' Coulomb repulsion on the local properties (density of states, electron pairing) of the superconductor. We show the condition of pi - like behaviour, defined as two subsystems having a phase difference of pi, in the system by using a proper combination of attractive pairing interaction and repulsive one located at impurity site.
Keywords
Cite
@article{arxiv.cond-mat/0411061,
title = {'Pi State' Induced by Impurities with a Repulsive Interaction},
author = {Grzegorz Litak and Mariusz Krawiec},
journal= {arXiv preprint arXiv:cond-mat/0411061},
year = {2009}
}
Comments
5 pages, 4 figures, to be published in Physica Status Solidi B