Dynamics of Thermomagnetic Avalanches in Melt-Textured YBaCuO Superconductors

Abstract

We investigated dynamics of the thermomagnetic avalanche development in melt-textured samples of the oxide YBaCuO high temperature superconductor. We found that the flux jumps, caused by the thermomagnetic instabilities, are accompanied by giant convergent oscillations of the surface induction. These results are compared with the dynamics of the flux jumps in other type-II superconductors, including conventional NbTi and oxide high temperature Bi 2 Sr 2 CaCu 2 O 8+δ superconductor, and discussed in the framework of the available model of the thermomagnetic avalanche development.

The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor

“…Studies of the avalanche-like processes, which are strongly nonlinear, are also interesting from theoretical point of view. The dynamics of the thermomagnetic avalanche remains poorly understood and needs further investigations [2]. It is known that demagnetizing effects strongly influence conditions of the flux jumps occurrence [3].…”