The Structure of Thermomagnetic Avalanches in Superconducting Disc of NbTi

S. Vasilieva, b, A. Nabiałeka, V. Chabanenkob, V. Rusakovc, S. Piechotaa and H. Szymczaka aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland bDonetsk Physico-Technical Institute, Ukrainian Academy of Sciences, 72 R. Luxemburg str., 83114, Donetsk, Ukraine cDonetsk National University, 24 Universitetskaya str., 83055, Donetsk, Ukraine

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Received: 25 09 2005;

We investigated dynamics of giant flux jumps, caused by thermomagnetic avalanches, in superconducting disc of conventional NbTi-50% superconductor. We studied surface magnetization, as well as changes of magnetic flux in the superconducting sample and in the area around it. The influence of the magnetic history on the flux jumps structure was investigated. The most complex structure of the flux jumps was found during sample remagnetization. The comparison between dynamic changes of the magnetic flux in the sample and in the area around it shows that, at the last stage of the thermomagnetic avalanche, a process of magnetic flux redistribution in the superconductor's volume occurs. This process is not accompanied by an entrance of additional flux lines into the superconductor's volume.

DOI: 10.12693/APhysPolA.109.661 PACS numbers: 74.60.Ec, 74.60.Ge