Vortex motion in coupled DyBa[sub 2]Cu[sub 3]O[sub 7]/(Y[sub 0. 6]Pr[sub 0. 4])Ba[sub 2]Cu[sub 3]O[sub 7] heterostructures

Conference · Tue Feb 01 00:00:00 EST 1994 · Journal of Superconductivity; (United States)

OSTI ID:7020665

Fivat, P; Triscone, J; Fischer, O ^[1]

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1. Univ. of Geneva (Switzerland)

Multilayer structures containing 24 A thick DyBa[sub 2]Cu[sub 3]O[sub 7] layers, separated by 96 A of an (Y[sub 0.6]Pr[sub 0.4])Ba[sub 2]Cu[sub 2]O[sub 7] alloy, are studied to investigate the effect of coupling on vortex dynamics. With the magnetic field perpendicular to the ab plane, and as a function of the number of superconducting layers in the structure, we find that the activation energy for flux motion increases, first linearly, and then saturates. This linear increase is taken as evidence that pancake vortices belonging to different DyBa[sub 2]Cu[sub 3]O[sub 7] layers are stacked and have a coupled motion. Above a characteristic number of superconducting layers N[sub c] shear of the vortex structures becomes important and the thermally activated process only displaces a stack of N[sub c] pancake vortices, meaning that the vortex lattice is turning three dimensional. In these structures we find N[sub c] to be 2 to 3. 13 refs., 7 figs.

• OSTI ID: 7020665
• Report Number(s): CONF-930710-; CODEN: JOUSEH; TRN: 94-014490
• Journal Information: Journal of Superconductivity; (United States), Vol. 7:1; Conference: Physics and chemistry of molecular and oxide superconductors conference, Eugene, OR (United States), 27-31 Jul 1993; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
ACTIVATION ENERGY
CRYSTAL STRUCTURE
BARIUM COMPOUNDS
CERAMICS
COUPLING
CUPRATES
DYSPROSIUM COMPOUNDS
MAGNETIC FIELDS
OXIDES
PRASEODYMIUM COMPOUNDS
VORTICES
YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ENERGY
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
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