Influence of the polycrystallinity on the paraconductivity in copper-oxide superconductors

The influence of long length scale structural inhomogeneities on the electrical resistivity of polycrystalline YBa 2Cu 3O 7−δ samples is analyzed on the grounds of an empirical picture proposed by our group some time ago. For that, the electrical resistivity, ρ(T), has been measured in different pol...

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Bibliographic Details
Published in:Journal of alloys and compounds 1993-05, Vol.195, p.627-630
Main Authors: Torrón, C., Cabeza, O., Diaz, A., Maza, J., Pomar, A., Veira, J.A., Vidal, Félix
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:The influence of long length scale structural inhomogeneities on the electrical resistivity of polycrystalline YBa 2Cu 3O 7−δ samples is analyzed on the grounds of an empirical picture proposed by our group some time ago. For that, the electrical resistivity, ρ(T), has been measured in different polycrystalline YBa 2Cu 3O 7−δ samples, all single phase to 4% and with δ ≲ 0.15, and the results compared with ρ ab(T), the intrinsic resistivity in the ab plane of single crystals with the same nominal composition. Our analysis fully confirms our earlier proposal that the structural inhomogeneities at scales much larger than the superconducting correlation length strongly affects the paraconductivity amplitude, but its reduced temperature behavior is not affected.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(93)90816-6