Simulation Studies on the Stability of the Vortex-Glass Order

TL;DR

This study uses Monte Carlo simulations to examine the stability of vortex-glass order in disordered superconductors, revealing that screening effects destabilize the order and that critical exponents differ from previous models.

Contribution

It provides new insights into the impact of screening on vortex-glass stability and reports differing critical exponents from earlier gauge-glass model studies.

Findings

Vortex-glass order is destroyed by screening effects.

Critical exponents differ significantly from gauge-glass model values.

Vortex-glass stability is sensitive to screening in disordered superconductors.

Abstract

The stability of the three-dimensional vortex-glass order in random type-II superconductors with point disorder is investigated by equilibrium Monte Carlo simulations based on a lattice XY model with a uniform field threading the system. It is found that the vortex-glass order, which stably exists in the absence of screening, is destroyed by the screenng effect, corroborating the previous finding based on the spatially isotropic gauge-glass model. Estimated critical exponents, however, deviate considerably from the values reported for the gauge-glass model.