Depinning and creep motion in glass states of flux lines

Details Depinning and creep motion in glass states of flux lines Depinning and creep motion in glass states of flux lines

2006-12-02

arxiv.org/abs/cond-mat/0612051v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, contact author: Xiao HU

Scientific paper

10.1103/PhysRevLett.98.267002

Using dynamical computer simulation we have investigated vortex matters in glass states. A genuine continuous depinning transition is observed at zero temperature, which also governs the low-temperature creep motion. With the notion of scaling, we evaluate in high accuracy critical exponents and scaling functions; we observe a non-Arrhenius creep motion for weak collective pinning where Bragg glass (BrG) is stabilized at equilibrium, while for strong pinning the well-known Arrhenius law is recovered. In both cases, a sharp crossover takes place between depinning and creep at low temperatures. The possible relation between the present results and a recent experimental observation of a second-order like phase boundary inside the BrG phase is discussed.

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