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Proceedings Paper

Investigations of coupled DyBa2Cu307-(Y1-xPrx)Ba2Cu307 multilayer structures
Author(s): Oystein Fischer; Jean-Marc Triscone; Patrice Fivat; M. Andersson; Michel Decroux
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Paper Abstract

We report on the behavior of high Tc superconductor coupled multilayer structures in magnetic field perpendicular to the ab plane. In these structures the number N of superconducting layers in the sample has been systematically varied. We extract the activation energy for flux motion from resistive measurements of the superconducting transitions. For samples containing N 24 angstroms thick DyBa2Cu3O7 layers, each separated from the next by 96 angstroms of an (formula available in paper) alloy, we find that the activation energy U increases linearly with the number N of layers for N < 3 - 4, and then saturates. The linear increase of U is taken as an evidence that coupling through (formula available in paper) increases the correlated volume involved in the flux motion and thus U. For N equals 3 stacked pancake vortices move rigidly and the vortex lattice is 2D. For N > 3 - 4 shear of the vortex lattice becomes important, the vortex lattice dimensionally crosses-over to 3D, and the activation energy saturates.

Paper Details

Date Published: 29 June 1994
PDF: 8 pages
Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); doi: 10.1117/12.179179
Show Author Affiliations
Oystein Fischer, Univ. de Geneve (Switzerland)
Jean-Marc Triscone, Univ. de Geneve (Switzerland)
Patrice Fivat, Univ. de Geneve (Switzerland)
M. Andersson, Univ. de Geneve (Switzerland)
Michel Decroux, Univ. de Geneve (Switzerland)


Published in SPIE Proceedings Vol. 2157:
Superconducting Superlattices and Multilayers
Ivan Bozovic, Editor(s)

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