Thermal depinning and creep in strong pinning theory

Abstract

Pinning and thermal creep determine the response of numerous systems containing superstructures, e.g., vortices in type II superconductors, domain walls in ferroics, or dislocations in metals. The combination of drive and thermal fluctuations lead to the superstructure's depinning and its velocity $v$ determines the electric, magnetic, or mechanical response. It is commonly believed that pinning and creep collapse above the critical drive $F_c$, entailing a sharp rise in the velocity $v$. We challenge this perception by studying the effects of thermal fluctuations within the framework of strong vortex pinning in type-II superconductors. In fact, we show that pinning and thermal creep persist far beyond the critical force. The resulting force-velocity characteristic largely maintains its zero-temperature shape and thermal creep manifests itself by a downward renormalisation of the critical drive. Such characteristics is in agreement with Coulomb's law of dry friction and has been often observed in experiments.

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Cited by in corpus (10)

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• Strong pinning theory of thermal vortex creep in type II superconductors
• Experimental test of strong pinning and creep in current-voltage characteristics of type II superconductors
• Thermal hysteresis of the Campbell response as a probe for bulk pinscape spectroscopy
• The role of rare events in the pinning problem
• Thermal creep emerging from cooling a tilted vortex lattice in uniaxial superconductor
• Two-dimensional Coulomb glass as a model for vortex pinning in superconducting films
• Higher critical currents yet faster vortex creep in EuBa${}_2$Cu${}_3$O${}_y$ films containing coherent artificial pinning centers
• Designing high-performance superconductors with nanoparticle inclusions: comparisons to strong pinning theory