Vortex avalanches at one thousandth the superconducting transition temperature
- The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
- NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We study the nonequilibrium dynamics of vortex motion at millikelvin temperatures in untwinned single crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Above threshold fields of many tesla, flux jumps appear in the magnetic hysteresis {ital B}({ital H}). These jumps correspond to a change of 750 vortices, on average, under our micrometer-sized Bi Hall probes. Not only are the threshold fields large, but they, and the characteristics of the flux jumps themselves, are essentially independent of magnet ramp rate or sample thickness, militating against a thermally triggered instability. Moreover, the threshold differs significantly on the ascending and descending branches of the hysteresis loop. We argue for a dynamical origin for these vortex avalanches and invoke a sandpile analogy to guide our detailed explorations of the {ital H}-{ital T} plane. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 283892
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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