Disordered vortex matter out of equilibrium: a Langevin molecular dynamics study

Abstract

We discuss the use of Langevin molecular dynamics in the investigation of the non-equilibrium properties of disordered vortex matter. Our special focus is set on values of system parameters that are realistic for disordered high-$T_c$ superconductors such as YBCO. Using a discretized elastic line model, we study different aspects of vortices far from thermal equilibrium. On the one hand we investigate steady-state properties of driven magnetic flux lines in a disordered environment, namely the current-voltage characteristics, the gyration radius, and the pinning time statistics. On the other hand we study the complex relaxation processes and glassy-like dynamics that emerge in type-II superconductors due to the intricate competition between the long-range vortex-vortex repulsion and flux pinning due to randomly placed point defects. To this end we consider different types of sudden perturbations: temperature, magnetic field, and external current quenches.

15 pages, 7 figures, to appear in Molecular Simulation for a special issue on "Nonequilibrium Systems"

References in corpus (7)

• Dynamics below the depinning threshold
• Creep dynamics of elastic manifolds via exact transition pathways
• Growing correlations and aging of an elastic line in a random potential
• Out-of-equilibrium relaxation of the Edwards-Wilkinson elastic line
• Relaxation dynamics of vortex lines in disordered type-II superconductors following magnetic field and temperature quenches
• Pinning time statistics for vortex lines in disordered environments
• Characterization of relaxation processes in interacting vortex matter through a time-dependent correlation length

Cited by in corpus (5)

• The effect of the Magnus force on skyrmion relaxation dynamics
• Dynamical regimes of vortex flow in type-II superconductors with parallel twin boundaries
• Critical Scaling and Aging near the Flux Line Depinning Transition
• Structural Relaxation and Aging Scaling in the Coulomb and Bose Glass Models
• Anisotropic vortex motion and two-dimensional superconducting transition