Vortex dynamics in layered superconductors with correlated defects: influence of interlayer coupling
A. Engel, H. J. Trodahl, J. C. Abele, D. Smith, S. M. Robinson
Abstract
We report a detailed study of the vortex dynamics and vortex phase diagrams of two amorphous Ta0.3Ge0.7/Ge multilayered films with intrinsic coplanar defects, but different interlayer coupling. A pinned Bose-glass phase in the more weakly coupled sample exists only below a cross-over field H* in striking contrast to the strongly coupled film. Above H* the flux lines are thought to break up into pancake vortices and the cross-over field is significantly increased when the field is aligned along the extended defects. The two films show different vortex creep excitations in the Bose-glass phase.
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