Nonlocal Conductivity in the Vortex-Liquid Regime of a Two-Dimensional Superconductor
arXiv:cond-mat/9604186 · doi:10.1103/PhysRevB.54.12413
Abstract
We have simulated the time-dependent Ginzburg-Landau equation with thermal fluctuations, to study the nonlocal dc conductivity of a superconducting film. Having examined points in the phase diagram at a wide range of temperatures and fields below the mean-field upper critical field, we find a portion of the vortex-liquid regime in which the nonlocal ohmic conductivity in real space is negative over a distance several times the spacing between vortices. The effect is suppressed when driven beyond linear response. Earlier work had predicted the existence of such a regime, due to the high viscosity of a strongly-correlated vortex liquid. This behavior is clearly distinguishable from the monotonic spatial fall-off of the conductivity in the higher temperature or field regimes approaching the normal state. The possibilities for experimental study of the nonlocal transport properties are discussed.
18 pages, revtex, 6 postscript figures
References in corpus (2)
Cited by in corpus (5)
- Long-range nonlocal flow of vortices in narrow superconducting channels
- Perturbative studies of the conductivity in the vortex-liquid regime
- A study of nonlocal conductivity in high-temperature superconductors
- Vortex Lattice in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ} Well Above the First-Order Phase-Transition Boundary
- Second ac screening step as a probe for the first-order melting transition in layered vortex matter at intermediate temperatures