Microavalanches Size Distribution in Fine Structure of Thermomagnetic Flux Jumps in the V₃Si Monocrystal Superconductor

Abstract

The fine structure of huge thermomagnetic flux jumps in V3Si single crystal was analyzed in detail. Structure of avalanches consists of several hundreds of microavalanches. The magnitude of the flux of the microavalanches and their duration were determined. The histograms of the distribution of microflux jumps magnitudes are plotted (the number of microavalanches as a function of the outgoing flux size) for different temperatures. The role of microstructure pinning centers was discussed on the assumption that microavalanches are jumps of flux bundles. In such case, fine structure of the avalanche can characterize the parameters of the pinning centers (size, number of pinned vortices, etc.).