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HIGH-Tc superconductivity in perovskite oxides of the Y-Ba-Cu-O system

Mohanram, RA and Sreedhar, K and Raychaudhuri, AK and Ganguly, P and Rao, CNR (1987) HIGH-Tc superconductivity in perovskite oxides of the Y-Ba-Cu-O system. In: Philosophical Magazine Letters, 55 (6). pp. 257-263.

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Several biphasic compositions of the type Y3-xBa3+xCu6O14 show 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 YBa2Cu3 O7. This oxide annealed in oxygen shows the onset of superconductivity at 120K and zero resistance at 87K. YBa2,Cu3O7 shows the highest Meissner effect of all oxide superconductors. The superconducting behaviour of the two perovskite oxides, Y0.95Ba1.95,Cu3O7 and Y1.05Ba1.95Cu3O7 show 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.

Item Type: Journal Article
Publication: Philosophical Magazine Letters
Publisher: Taylor and Francis Group
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Aug 2009 06:36
Last Modified: 12 Aug 2009 06:36
URI: http://eprints.iisc.ac.in/id/eprint/20926

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