Transport Critical Currents in Spray Pyrolyzed Films of TlBa sub 2 Ca sub 2 Cu sub 3 O sub z on Polycrystalline Zirconia Substrates

Large critical currents with a relatively weak magnetic field dependence are obtained in thick films of TlBa sub 2 Ca sub 2 Cu sub 3 O sub z . Transport measurements indicate J sub c > 10 exp 5 A/cm exp 2 at 77K, zero field, and J sub c > 10 exp 4 at 60K in a 2 T field applied along the c-axis...

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Bibliographic Details
Published in:Applied physics letters 1992-08, Vol.61 (5), p.610-612
Main Authors: Tkaczyk, J E, DeLuca, J A, Karas, P L, Bednarczyk, P J, Garbauskas, M F, Arendt, R H, Lay, K W, Moodera, J S
Format: Article
Language:English
Subjects:
360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)
ALIGNMENT
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CRYSTALS
CURRENTS
DECOMPOSITION
DEPOSITION
ELECTRIC CURRENTS
GRAIN BOUNDARIES
GRANULAR MATERIALS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MATERIALS
MATERIALS SCIENCE
MICROSTRUCTURE
MIXED STATE
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
PYROLYSIS
SPRAY COATING
SUPERCONDUCTORS
SURFACE COATING
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
VORTICES
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Summary:Large critical currents with a relatively weak magnetic field dependence are obtained in thick films of TlBa sub 2 Ca sub 2 Cu sub 3 O sub z . Transport measurements indicate J sub c > 10 exp 5 A/cm exp 2 at 77K, zero field, and J sub c > 10 exp 4 at 60K in a 2 T field applied along the c-axis. The observed behavior is attributed to a large degree of uniaxial alignment of platelike grains, and to superior intragranular flux pinning. These results are consistent with recent theories concerning the nature of vortices in highly anisotropic (layered) superconductors and "brick wall" models of intergranular current transport.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.107852