Steps in the Negative-Differential-Conductivity Regime of a Superconductor
arXiv:cond-mat/0204589 · doi:10.1103/PhysRevLett.87.177001
Abstract
Current-voltage characteristics were measured in the mixed state of Y1Ba2Cu3O(7-delta) superconducting films in the regime where flux flow becomes unstable and the differential conductivity dj/dE becomes negative. Under conditions where its negative slope is steep, the j(E) curve develops a pronounced staircase like pattern. We attribute the steps in j(E) to the formation of a dynamical phase consisting of the succesive nucleation of quantized distortions in the local vortex velocity and flux distribution within the moving flux matter.
5 pages, 3 figures
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