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

作者：Assi Hiba; Chaturvedi Harshwardhan; Dobramysl Ulrich; Pleimling Michel^*; Tauber Uwe C

来源：Molecular Simulation, 2016, 42(16): 1401-1409.

DOI：10.1080/08927022.2015.1119826

• Langevin molecular dynamics
• disordered vortex matter
• type-II superconductors
• pinning statistics
• relaxation processes

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 discretised 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.

• 出版日期2016