Investigation of coupled DyBa2Cu3O7-(Y1-xPrx)Ba2Cu3O7 multilayer structures
1994 (English)In: Superconducting Superlattices and Multilayers / [ed] Ivan Bozovic, Bellingham: SPIE - International Society for Optical Engineering, 1994, Vol. 2157, 134-141 p.Conference paper (Refereed)
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 (Y0.45Pr0.55)Ba2Cu3O7 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 (Y0.45Pr0.55)Ba2Cu3O7 increases the correlated volume involved in the flux motion and thus U. For N = 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.
Place, publisher, year, edition, pages
Bellingham: SPIE - International Society for Optical Engineering, 1994. Vol. 2157, 134-141 p.
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277786X ; 2157
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-50760DOI: 10.1117/12.179179ISBN: 0819414522OAI: oai:DiVA.org:kth-50760DiVA: diva2:462633
Superconducting Superlattices and Multilayers. Los Angeles, CA, USA. 24 January 1994 - 25 January 1994
QC 201112132011-12-072011-12-072011-12-13Bibliographically approved