Critical current density versus normal-state resistivity in granular high-temperature superconductors with different average grain size

The resistivity, rho , and the critical current density at zero applied magnetic field, J sub(c), of ceramic Y sub(1)Ba sub(2)Cu sub(3)O sub(7- delta ) samples with different average grain size, a (from 5 to 14 mu m), are reported. These results show that at a given temperature J sub(c) depends only...

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Bibliographic Details
Published in:Superconductor science & technology 2000-07, Vol.13 (7), p.1005-1010
Main Authors: Currás, S R, Veira, J A, Maza, J, Vidal, Félix
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical currents
Exact sciences and technology
Granular, melt-textured, amorphous and composite superconductors
Inhomogeneous superconductors and superconducting systems
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:The resistivity, rho , and the critical current density at zero applied magnetic field, J sub(c), of ceramic Y sub(1)Ba sub(2)Cu sub(3)O sub(7- delta ) samples with different average grain size, a (from 5 to 14 mu m), are reported. These results show that at a given temperature J sub(c) depends only on the specific contact resistance of the average grain boundary junction, rho sub( square ), so that the product J sub(c) rho sub( square ) is sample independent. The relevance of rho sub( square ) and not of a on J sub(c) has been further tested on a subset of samples having very different average grain size but similar rho sub( square ) for which negligible variations of J sub(c) are observed.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/13/7/317