Avalanches and Self-Organized Criticality in superconductors |
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Authors: | R J Wijngaarden M S Welling C M Aegerter M Menghini |
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Institution: | (1) Department of Physics and Astronomy, Faculty of Sciences, Free University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands |
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Abstract: | 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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Keywords: | 05 65 +b Self-organized systems 74 25 Fy Transport properties (electric and thermal conductivity thermoelectric effects etc ) 74 25 Qt Vortex lattices flux pinning flux creep |
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