Quantum constraints on technological superconductors
- 14 June 1999
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 74 (24) , 3699-3701
- https://doi.org/10.1063/1.123225
Abstract
Vortex pinning in textured Bi2Sr2CaCu2Ox/Ag superconducting tapes was enhanced by irradiation with 0.8 GeV protons, creating randomly oriented columnar defects. Measurements of the current density J versus time show that thermally-activated current decay was greatly decreased, compared with unirradiated tapes. However, temperature-independent quantum tunneling of vortices considerably limits J and its temporal stability, for a significant fraction of the finite-Jc region.Keywords
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