Avalanches and self-organized criticality in superconductors

Avalanches and self-organized criticality in superconductors

We review the use of superconductors as a playground for the experimental study of front roughening and avalanches. Using the magneto-optical technique, the spatial distribution of the vortex density in the sample is monitored as a function of time. The roughness and growth exponents corresponding t...

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Veröffentlicht in:European Physical Journal B, Condensed Matter Physics Condensed Matter Physics, 2006, Vol.50 (1), p.117-122
Hauptverfasser: Wijngaarden, R.J, Welling, M.S, Aegerter, C.M, Menghini, Mariela Andrea
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Aegerter, C.M
Menghini, Mariela Andrea
description We review the use of superconductors as a playground for the experimental study of front roughening and avalanches. Using the magneto-optical technique, the spatial distribution of the vortex density in the sample is monitored as a function of time. The roughness and growth exponents corresponding to the vortex 'landscape' are determined and compared to the exponents that characterize the avalanches in the framework of Self-Organized Criticality. For those situations where a thermo-magnetic instability arises, an analytical non-linear and non-local model is discussed, which is found to be consistent to great detail with the experimental results. On anisotropic substrates, the anisotropy regularizes the avalanches.
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title Avalanches and self-organized criticality in superconductors
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