Phase Transitions in a Model Anisotropic High Tc Superconductor

TL;DR

This paper uses simulations of an anisotropic 3D XY model to explore phase transitions in high Tc superconductors, revealing that superconducting coherence persists into the vortex line liquid state.

Contribution

It provides new insights into the phase diagram and vortex behavior in anisotropic high Tc superconductors through detailed simulation results.

Findings

Superconducting coherence persists into the vortex line liquid state.

The transition occurs below the mean-field crossover.

Phase diagram depends on temperature and anisotropy.

Abstract

We carry out simulations of the anisotropic uniformly frustrated 3D XY model, as a model for vortex line fluctuations in high Tc superconductors. We compute the phase diagram as a function of temperature and anisotropy, for a fixed applied magnetic field. We find that superconducting coherence parallel to the field persists into the vortex line liquid state, and that this transition lies well below the "mean-field" cross-over from the vortex line liquid to the normal state.