Steps in the Negative-Differential-Conductivity Regime of a Superconductor
Milind N. Kunchur, B. I. Ivlev, J. M. Knight
DOI 10.1103/PhysRevLett.87.177001 · Physical Review Letters
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Abstract
Current-voltage characteristics were measured in the mixed state of Y1Ba2Cu3O7−δ 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 staircaselike pattern. We attribute the steps in j(E) to the formation of a dynamical phase consisting of the successive nucleation of quantized distortions in the local vortex velocity and flux distribution within the moving flux matter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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