G. Will, N. Masciocchi, et al.
Zeitschrift fur Kristallographie - New Crystal Structures
Paper
Quantum tunneling of vortices in Bi-2212 with randomly oriented columnar defects
Abstract
Vortex pinning in textured Bi-2212/Ag superconducting tapes was enhanced by randomly oriented columnar defects, formed by GeV proton-induced fission of Bi-nuclei. Studies of J versus time in the range 2-40 K shows that thermally activated current decay decreased greatly. However, temperature-independent quantum tunneling of vortices considerably limits J and its temporal stability for a significant fraction of the finite-Jc region. © 2000 Elsevier Science B. V. All rights reserved.
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