Dynamics of vortex glass phase in strongly type II superconductors

TL;DR

This study investigates vortex dynamics in strongly disordered type-II superconductors using large-scale simulations, revealing a finite temperature vortex glass transition, distinct critical exponents, and a continuous zero-temperature depinning transition with non-Arrhenius creep behavior.

Contribution

It provides new evidence for the vortex glass transition in the unscreened limit and identifies unique critical exponents and depinning characteristics in the models studied.

Findings

Finite temperature vortex glass transition confirmed.

Distinct correlation length and dynamic exponents observed.

Continuous depinning transition with non-Arrhenius creep motion detected.

Abstract

Dynamics of vortices in strongly type-II superconductors with strong disorder is investigated within the frustrated three-dimensional XY model. For two typical models in [Phys. Rev. Lett. {\bf 91}, 077002 (2003)] and [Phys. Rev. B {\bf 68}, 220502(R) (2003)], a strong evidence for the finite temperature vortex glass transition in the unscreened limit is provided by performing large-scale dynamical simulations. The obtained correlation length exponents and the dynamic exponents in both models are different from each other and from those in the three-dimensional gauge glass model. In addition, a genuine continuous depinning transition is observed at zero temperature for both models. A scaling analysis for the thermal rounding of the depinning transition shows a non-Arrhenius type creep motion in the vortex glass phase, contrarily to the recent studies..