Effect of structural water on the critical characteristics of highly textured Y[Ba.sub.2][Cu.sub.3][O.sub.6.9]

The effect of low-temperature treatment (200°C) in a humid argon atmosphere and subsequent annealing (930°C) on the critical parameters of a highly textured Y[Ba.sub.2][Cu.sub.3][O.sub.6.9] has been studied. During annealing at T = 200°C, the absorbed water is incorporated into the structure of the...

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Bibliographic Details
Published in:Physics of the solid state 2014-09, Vol.56 (9), p.1742
Main Authors: Bobylev, I.B, Gerasimov, E.G, Zyuzeva, N.A
Format: Article
Language:English
Subjects:
Annealing
Magnetic fields
Superconductors
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Summary:The effect of low-temperature treatment (200°C) in a humid argon atmosphere and subsequent annealing (930°C) on the critical parameters of a highly textured Y[Ba.sub.2][Cu.sub.3][O.sub.6.9] has been studied. During annealing at T = 200°C, the absorbed water is incorporated into the structure of the compound, which is accompanied by the deterioration of its superconducting properties. However, after the recovery annealing at T = 930°C and subsequent oxidation, the superconducting characteristics ([j.sub.c], [B.sub.1c], and [F.sub.p]) are improved. This is explained by the formation of 124-type planar defects, which are effective pinning centers, especially in high fields applied perpendicular to the c axis ([perpendicular to]c). The optimum conditions of double annealing substantially increasing the critical current density ([j.sub.c] [greater than or equal to] [10.sup.4] A/[cm.sup.2]) in an external magnetic field up to 10 T and also the first critical fields have been found. In fields up to ~3 T, the critical current density [j.sub.c] is isotropic despite the conservation of high texture in the samples.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783414090066