Dynamic Creation and Annihilation of Metastable Vortex Phase as a Source of Excess Noise

Details Dynamic Creation and Annihilation of Metastable Vortex Phase as a Source of Excess Noise Dynamic Creation and Annihilation of Metastable Vortex Phase as a Source of Excess Noise

2002-03-14

arxiv.org/abs/cond-mat/0203307v2

Europhys. Lett. 58, 112 (2002)

Physics

Condensed Matter

Superconductivity

5 pages 3 figures. Accepted for publication in Europhysics letters

Scientific paper

10.1209/epl/i2002-00613-1

The large increase in voltage noise, commonly observed in the vicinity of the peak-effect in superconductors, is ascribed to a novel noise mechanism. A strongly pinned metastable disordered vortex phase, which is randomly generated at the edges and annealed into ordered phase in the bulk, causes large fluctuations in the integrated critical current of the sample. The excess noise due to this dynamic admixture of two distinct phases is found to display pronounced reentrant behavior. In the Corbino geometry the injection of the metastable phase is prevented and, accordingly, the excess noise disappears

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