Scaling Behaviors and Novel Creep Motion of Flux Lines under AC Driving

Details Scaling Behaviors and Novel Creep Motion of Flux Lines under AC Driving Scaling Behaviors and Novel Creep Motion of Flux Lines under AC Driving

2011-04-27

arxiv.org/abs/1104.5146v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

We performed Langevin dynamics simulations for the \textit{ac} driven flux lines in a type II superconductor with random point-like pinning centers. Scaling properties of flux-line velocity with respect to instantaneous driving force of small frequency and around the critical \textit{dc} depinning force are revealed successfully, which provides precise estimates on dynamic critical exponents. From the scaling function we derive a creep law associated with the activation by the regular shaking. The effective energy barrier vanishes at the critical dc depinning point in a square-root way when the instantaneous driving force increases. The frequency plays a similar role of temperature in conventional creep motions, but in a nontrivial way governed by the critical exponents. We have also performed systematic finite-size scaling analysis for flux-line velocity in transient processes with \textit{dc} driving, which provide estimates on critical exponents in good agreement with those derived with ac driving. The scaling law is checked successfully.

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