Magnetic flux dynamics in critical state of one-dimensional discrete superconductor

摘要

We give a theoretical description of avalanche-like dynamics of magnetic fluxin the critical state of "hard" type-II superconductors using a model of aone-dimensional multijunction SQUID that well reproduces the main magneticproperties of these objects. We show that the system under considerationdemonstrates the self-organized criticality. The avalanches of vorticesmanifest themselves as jumps of the total magnetic flux in the sample. Thesizes of these jumps have a power-law distribution. Our results are inqualitative agreement with experiments.