Abstract
Abstract The goal of this research is the study of the thermomagnetic behavior of isotropic type-II superconductors, subjected to an external magnetic field H a = H ay y ^ + H az z ^ , throughout the instability field H if calculation which is closely related with a flux jump. At the critical-state model framework the Lorentz F L and pinning forces F P are at equilibrium, the current density reaches a critical value j c and a stationary magnetic induction distribution B is established therein the sample. In this work, the equilibrium of forces is solved analytically; for this purpose is considered that the pinning force depends on the temperature, meanwhile changes on the latter are produced by energy dissipation at the adiabatic regime. It is obtained a set of instability fields H if and they are compared with experimental flux jumps, a good agreement is found suggesting that such instabilities are intrinsic to the superconducting material properties.
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