Universitat Autònoma de Barcelona
2006
The field-amplitude and frequency dependent complex ac susceptibility of a well sinteredYBa2Cu3O7-δ disk has been measured at 77K, which shows that its intra- and intergranular critical-current densities are determined by the collective flux creep inside the grains and the maximum Josephsoncurrents across the grain boundaries, respectively. While the former is widely recognized, the latter contrasts to a popular belief of a mechanism of Josephson-vortex pinning and creep.
Article
Anglès
High temperature superconductivity; Superconductivity models; Sintering; Creep; Josephson effect; Josephson junctions; Critical currents; Flux creep; Rotating flows; Superconductors
Applied physics letters ; Vol. 89, Issue 7 (August 2006), p. 072501/1-072501/3
open access
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