J.Z. Sun, W.J. Gallagher, et al.
Applied Physics Letters
Paper
Quantum constraints on technological superconductors
Abstract
The regime of rapid thermal activation is addressed in prototype Bi2Sr2CaCu2Ox/Ag tapes containing splayed columnar defects. Although the thermally-activated decay of current diminishes greatly, significant rates of temperature-independent current decay remain due to quantum tunneling of vortices between strong pinning centers. The quantum process dominates the vortex dynamics up to 10 K or more and considerably limits long term current transport in the sample materials.
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