High anisotropy and a dimensionality crossover in the irreversibility behavior of oxygen-deficient YBa sub 2 Cu sub 3 O sub 7 minus y

The width in temperature of the reversible, lossy state of high-temperature superconductors (HTS's) in a magnetic field {ital H} depends on the degree of anisotropy. Compared to the parent compound YBa{sub 2}Cu{sub 3}O{sub 7}, we show here that oxygen-deficient, YBa{sub 2}Cu{sub 3}O{sub 7{minus...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1992-05, Vol.45:17
Main Authors: Gray, K.E., Kim, D.H., Veal, B.W., Seidler, G.T., Rosenbaum, T.F., Farrell, D.E.
Format: Article
Language:English
Subjects:
360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
MATERIALS SCIENCE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:The width in temperature of the reversible, lossy state of high-temperature superconductors (HTS's) in a magnetic field {ital H} depends on the degree of anisotropy. Compared to the parent compound YBa{sub 2}Cu{sub 3}O{sub 7}, we show here that oxygen-deficient, YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} single crystals, in which {ital T}{sub {ital c}} was varied from 10 to 55 K, are much more anisotropic and that the occurrence of the reversible, lossy state for the {bold H}{parallel}{ital c} axis is consistent with a crossover from three-dimensional (3D) vortex lines to 2D vortices, as recently proposed for the other highly anisotropic HTS's. These results, together with those from Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}}, indicate universal behavior of almost isolated Cu-O bilayer units, albeit with different doping levels, and which display magnetic reversibility controlled by the residual weak interplanar coupling.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.45.10071