Vortices and Dissipation in a Bilayer Thin Film Superconductor
Abstract
Vortex dynamics in a bilayer thin film superconductor are studied through a Josephson-coupled double layer XY model. A renormalization group analysis shows that there are three possible states associated with the relative phase of the layers: a free vortex phase, a logarithmically confined vortex-antivortex pair phase, and a linearly confined phase. The phases may be distinguished by measuring the resistance to counterflow current. For a geometry in which current is injected and removed from the two layers at the same edge by an ideal (dissipationless) lead, we argue that the three phases yield distinct behaviors: metallic conductivity in the free vortex phase, a power law I-V in the logarithmically confined phase, and true dissipationless superconductivity in the linearly confined phase. Numerical simulations of a resistively shunted Josephson junction model reveal size dependences for the resistance of this system that support these expectations.
Keywords
Cite
@article{arxiv.cond-mat/0502402,
title = {Vortices and Dissipation in a Bilayer Thin Film Superconductor},
author = {Wei Zhang and H. A. Fertig},
journal= {arXiv preprint arXiv:cond-mat/0502402},
year = {2009}
}
Comments
17 pages, 2 figures