Avalanches in the Bean critical state: a characteristic of the random pinning potential
Instituto de Ciencia de Materiales, CSIC
Universidad Autónoma de Madrid C-III - E-28049 Madrid, Spain
2 Department of Mathematics, Imperial College - 180 Queen's Gate, London SW7 2BZ, United Kingdom
Accepted: 12 December 1995
We report on two-dimensional simulations of the avalanche response of vortices in the Bean critical state of type-II superconductors. Two different kinds of repulsive-particle models are considered in order to make the findings generic. We use repulsive two-body potentials to represent the vortex-vortex interaction and an attractive two-body potential to represent the interaction between the static pinning wells and the vortices. We find that a collection of very short-ranged dense pinning centres leads to a broad distribution of response avalanches, whereas broader and less dense pinning centres produce a narrow distribution of responses.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion
© EDP Sciences, 1996