Flux line relaxation kinetics following current quenches in disordered type-II superconductors
Journal of Statistical Mechanics: Theory and Experiment
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Chaturvedi, H., Assi, H., Dobramysl, U., Pleimling, M., & Täuber, U. (2016). Flux line relaxation kinetics following current quenches in disordered type-II superconductors. Journal of Statistical Mechanics: Theory and Experiment, 2016 (8)https://doi.org/10.1088/1742-5468/2016/08/083301
© 2016 IOP Publishing Ltd and SISSA Medialab srl. We investigate the relaxation dynamics of magnetic vortex lines in type-II superconductors following rapid changes of the external driving current by means of an elastic line model simulated with Langevin molecular dynamics. A system of flux vortices in a sample with randomly distributed point-like defects is subjected to an external current of appropriate strength for a sufficient period of time so as to be in a moving non-equilibrium steady state. The current is then instantaneously lowered to a value that pertains to either the moving or pinned regime. The ensuing relaxation of the flux lines is studied via one-time observables such as their mean velocity and radius of gyration. We have in addition measured the two-time flux line height autocorrelation function to investigate dynamical scaling and aging behavior in the system, which in particular emerge after quenches into the glassy pinned state.
External DOI: https://doi.org/10.1088/1742-5468/2016/08/083301
This record's URL: https://www.repository.cam.ac.uk/handle/1810/269421