Abstract
Abstract For the first time, time-dependent fine structure of a huge magnetic flux avalanches, Φ ( t ), going out from good crystalline quality superconducting disc as a result of thermomagnetic avalanche, was observed. It is shown that some of thermomagnetic avalanches consist of a large number of very short (∼10 μs) microavalanches and that each of the microavalanche has its own structure. The role of microstructure of pinning centers is discussed assuming that microavalanches are connected with jumps of flux bundles. Methodically, it may be a new facility for pinning centers investigation. The role of cubic-to-tetragonal transformation of a crystal structure of the investigated sample in appearance of pinning centers is considered.
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