Off equilibrium properties of vortex creep in superconductors

Abstract

We study a model for the dynamics of vortices in type II superconductors. In particular, we discuss glassy ``off equilibrium'' properties and ``aging'' in magnetic creep. At low temperatures a crossover point is found, Tg, where relaxation times seem to diverge a' la Vogel-Tamman-Fulcher. Magnetic creep changes by crossing Tg: above Tg power law creep is found asymptotically followed by stretched exponential saturation; below Tg the creep is logarithmic and vortex motion strongly subdiffusive. In this region violation of time translation invariance is found along with important dynamical scaling properties. A thermodynamic glassy transition point can be found at a lower temperature Tc.

published version

References in corpus (5)

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• Absence of Thermodynamic Phase Transition in a Model Glass Former
• Vortices Freeze like Window Glass: the Vortex Molasses Scenario
• Off equilibrium magnetic properties in a model for vortices in superconductors
• Vortices Clustering: The Origin of the Second Peak in the Magnetisation Loops of High Temperature Superconductors

Cited by in corpus (6)

• Record dynamics and the observed temperature plateau in the magnetic creep rate of type II superconductors
• Aging and memory phenomena in magnetic and transport properties of vortex matter: a brief review
• Relaxation and Glassy Dynamics in Disordered Type-II Superconductors
• A Simple Model for Plastic Dynamics of a Disordered Flux Line Lattice
• Relaxation dynamics in type-II superconductors with point-like and correlated disorder
• Memory effects in response functions of driven vortex matter