Investigations of coupled DyBa2Cu307-(Y1-xPrx)Ba2Cu307 multilayer structures

Oystein Fischer; Jean-Marc Triscone; Patrice Fivat; M. Andersson; Michel Decroux

doi:10.1117/12.179179

29 June 1994 Investigations of coupled DyBa2Cu307-(Y1-xPrx)Ba2Cu307 multilayer structures

Oystein Fischer, Jean-Marc Triscone, Patrice Fivat, M. Andersson, Michel Decroux

Proceedings Volume 2157, Superconducting Superlattices and Multilayers; (1994) https://doi.org/10.1117/12.179179
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We report on the behavior of high T_c 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.

Citation Download Citation

Oystein Fischer, Jean-Marc Triscone, Patrice Fivat, M. Andersson, and Michel Decroux "Investigations of coupled DyBa2Cu307-(Y1-xPrx)Ba2Cu307 multilayer structures", Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); https://doi.org/10.1117/12.179179

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