Self-organized criticality induced by quenched disorder: experiments on flux avalanches in NbH$_x$ films

Details Self-organized criticality induced by quenched disorder: experiments on flux avalanches in NbH$_x$ films Self-organized criticality induced by quenched disorder: experiments on flux avalanches in NbH$_x$ films

2004-10-14

arxiv.org/abs/cond-mat/0410369v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.104515

We present an experimental study of the influence of quenched disorder on the distribution of flux avalanches in type-II superconductors. In the presence of much quenched disorder, the avalanche sizes are power-law distributed and show finite size scaling, as expected from self-organized criticality (SOC). Furthermore, the shape of the avalanches is observed to be fractal. In the absence of quenched disorder, a preferred size of avalanches is observed and avalanches are smooth. These observations indicate that a certain minimum amount of disorder is necessary for SOC behavior. We relate these findings to the appearance or non-appearance of SOC in other experimental systems, particularly piles of sand.

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