New Universality Class at the Superconductor--Insulator Transition

Details New Universality Class at the Superconductor--Insulator Transition New Universality Class at the Superconductor--Insulator Transition

1996-08-24

arxiv.org/abs/cond-mat/9608115v1

Physics

Condensed Matter

4 pages, revtex, eps-figures

Scientific paper

10.1103/PhysRevLett.78.1779

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.

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