Internal avalanches in a pile of superconducting vortices

Details Internal avalanches in a pile of superconducting vortices Internal avalanches in a pile of superconducting vortices

1999-02-25

arxiv.org/abs/cond-mat/9902334v1

Physics

Condensed Matter

Superconductivity

5 pages including 5 figures

Scientific paper

10.1103/PhysRevB.61.R3815

Using an array of miniature Hall probes, we monitored the spatiotemporal variation of the internal magnetic induction in a superconducting niobium sample during a slow sweep of external magnetic field. We found that a sizable fraction of the increase in the local vortex population occurs in abrupt jumps. The size distribution of these avalanches presents a power-law collapse on a limited range. In contrast, at low temperatures and low fields, huge avalanches with a typical size occur and the system does not display a well-defined macroscopic critical current.

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