New Universality Class at the Superconductor--Insulator Transition
Condensed Matter
2009-10-28 v1
Abstract
We study dynamic properties of thin films near the superconductor - insulator transition. We formulate the problem in a phase representation. The key new feature of our model is the assumption of a {\it local} ohmic dissipative mechanism. Coarse graining leads to a Ginzburg-Landau description, with non-ohmic dynamics for the order parameter. For strong enough damping a new universality class is observed. It is characterized by a {\it non-universal} d.c. conductivity, and a damping dependent dynamical critical exponent. The formulation also provides a description of the magnetic field-tuned transition. Several microscopic mechanisms are proposed as the origin of the dissipation.
Cite
@article{arxiv.cond-mat/9608115,
title = {New Universality Class at the Superconductor--Insulator Transition},
author = {Karl-Heinz Wagenblast and Anne van Otterlo and Gerd Schön and Gergely T. Zimányi},
journal= {arXiv preprint arXiv:cond-mat/9608115},
year = {2009}
}
Comments
4 pages, revtex, eps-figures