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Phys Rev Lett. 2007 Jun 29;98(26):267002. Epub 2007 Jun 26.

Depinning and creep motion in glass States of flux lines.

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1
Computational Materials Science Center, National Institute for Materials Science, Tsukuba 305-0047, Japan.

Abstract

Using dynamical computer simulation, we investigate vortex matter 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 the Bragg glass 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.

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