Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
63 (1993), S. 3081-3083
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A layered melt-textured YBa2Cu3O7−x superconductor has been prepared consisting of alternate fully oxygenated and oxygen deficient bands stacked parallel to a-b planes. An anomalous decrease of Jcc(H(parallel)ab) with field is observed at high temperatures. We show that this behavior is a signature of a field induced decoupling of the strong superconducting bands, and provides evidence of a decrease of vortex pinning energy in oxygen deficient regions of melt-textured YBa2Cu3O7−x. A large downwards shift of the irreversibility line results as a consequence of the substantially smaller area where a critical state sets in. When vortices are parallel to the c-axis Jcab(H(parallel)c) decreases due to the smaller condensation energy of the oxygen deficient bands.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.110239
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