Investigations of coupled DyBa{sub 2}Cu{sub 3}O{sub 7}-(Y{sub 1{minus}x}Pr{sub x})Ba{sub 2}Cu{sub 3}O{sub 7} multilayer structures
- Univ. of Geneva (Switzerland)
The authors 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. They extract the activation energy for flux motion from resistive measurements of the superconducting transition. For samples containing N 24{angstrom} thick DyBa{sub 2}Cu{sub 3}O{sub 7} layers, each separated from the next by 96{angstrom} of an ({sub 0.45}Pr{sub 0.55})Ba{sub 2}Cu{sub 3}O{sub 7} alloy, they 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 evidence that coupling through ({sub 0.45}Pr{sub 0.55})Ba{sub 2}Cu{sub 3}O{sub 7} 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 2-D. For N > 3--4 shear of the vortex lattice becomes important, the vortex lattice dimensionality crosses-over to 3-D, and the activation energy saturates. 58 refs.
- OSTI ID:
- 82833
- Report Number(s):
- CONF-940142-; ISBN 0-8194-1452-2; TRN: IM9533%%291
- Resource Relation:
- Conference: OE/LASE `94: conference on optics, electro-optics, and laser applications in science and engineering, Los Angeles, CA (United States), 22-29 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Superconducting superlattices and multilayers. Proceedings SPIE Volume 2157; Bozovic, I. [ed.] [Varian Associates Inc., Palo Alto, CA (United States). E.H. Ginzton Research Center]; PB: 386 p.
- Country of Publication:
- United States
- Language:
- English
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