Steps in the Negative-Differential-Conductivity Regime of a Superconductor

Details Steps in the Negative-Differential-Conductivity Regime of a Superconductor Steps in the Negative-Differential-Conductivity Regime of a Superconductor

2002-04-27

arxiv.org/abs/cond-mat/0204589v1

Phys. Rev. Lett. 87, 177001 (2001)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.87.177001

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.

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