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    Flux line relaxation kinetics following current quenches in disordered type-II superconductors

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    Chaturvedi, H.
    Assi, H.
    Dobramysl, U.
    Pleimling, M.
    Täuber, Uwe C.
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    Abstract
    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.
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    http://hdl.handle.net/10919/73061
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    • Scholarly Works, Department of Physics [811]

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