We investigate flux front penetration in a disordered type-II superconductor by molecular dynamics simulations of interacting vortices and find scaling laws for the front position and the density profile. The scaling can be understood by performing a coarse graining of the system and writing a disordered nonlinear diffusion equation. Integrating numerically the equation, we observe a crossover from flat to fractal front penetration as the system parameters are varied. The value of the fractal dimension indicates that the invasion process is described by gradient percolation.

Flux front penetration in disordered superconductors / S. Zapperi, A.A. Moreira, A.J. S. Andrade Jr.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 86:16(2001), pp. 3622-3625.

Flux front penetration in disordered superconductors

S. Zapperi;
2001

Abstract

We investigate flux front penetration in a disordered type-II superconductor by molecular dynamics simulations of interacting vortices and find scaling laws for the front position and the density profile. The scaling can be understood by performing a coarse graining of the system and writing a disordered nonlinear diffusion equation. Integrating numerically the equation, we observe a crossover from flat to fractal front penetration as the system parameters are varied. The value of the fractal dimension indicates that the invasion process is described by gradient percolation.
Bean critical-stae; magnetization hysteresis loops; vortex avalanches; plastic-flow; model; vortices; dynamics; lattice; density; films
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
2001
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/655595
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