D. Agassi et Rd. Bardo, FLUX-PINNING AND CRITICAL CURRENTS IN A DISORDERED GRAIN-BOUNDARY MODEL, Physica. C, Superconductivity, 210(1-2), 1993, pp. 127-132
The pinning potential and critical currents of a S-S'-S junction with
a slab geometry, in the presence of penetration depth fluctuations in
S', are evaluated in the London limit. This junction serves as a model
for flux pinning grain boundaries. Disorder induced pinning is found
to extend into the S domains over a distance comparable to the penetra
tion depth. For ''realistic'' parameters, the calculated critical curr
ents have a weak dependence on the grain boundary misalignment angle a
nd high values. Comparison with relevant data is discussed.