HIGH-Tcsuperconductivity in perovskite oxides of the Y─Ba─Cu─O system
作者:
R.A. Mohanram,
K. Sreedhar,
A.K. Raychaudhuri,
P. Ganguly,
C.N. R. Rao,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1987)
卷期:
Volume 55,
issue 6
页码: 257-263
ISSN:0950-0839
年代: 1987
DOI:10.1080/09500838708214694
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Several biphasic compositions of the type Y3−xBa3+xCu6O14show an onset of superconductivity in the 90-115K range, attaining zero resistance in the 70-85K range. The phase responsible for superconductivity in these compositions is a perovskite oxide of composition YBa2Cu3O7. This oxide annealed in oxygen shows the onset of superconductivity at 120K and zero resistance at 87K. YBa2,Cu3O7shows the highest Meissner effect of all oxide superconductors. The superconducting behaviour of the two perovskite oxides, Y0.95Ba1.95,Cu3O7and Y1.05Ba1.95Cu3O7show interesting features; a marked decrease in resistivity is observed from room temperature itself in the former oxide with zero resistance at 89K. Electron microscopy and infrared spectra of these oxides are briefly discussed.
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