Abstract
We study the vortex dynamics in the instability regime induced by high dissipative stateswell above the critical current in Nb superconducting strips. The magnetic field andtemperature behavior of the critical vortex velocity corresponding to the observed dynamicinstability is ascribed to intrinsic non-equilibrium phenomena. The Larkin–Ovchinnikov(LO) theory of electronic instability in high velocity vortex motion has been applied tointerpret the temperature dependence of the critical vortex velocity. The magnetic fielddependence of the vortex critical velocity shows new features in the low-field regime notpredicted by LO.
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