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High-$T_c$ 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-$T_c$ 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 $Y_{3-x}Ba_{3+x}Cu_6O_{14}$ 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 $YBa_2Cu_3O_7$. This oxide annealed in oxygen shows the onset of superconductivity at 120K and zero resistance at 87K. $YBa_2$, $Cu_3O_7$ shows the highest Meissner effect of all oxide superconductors. The superconducting behaviour of the two perovskite oxides, $Y_{0.95}Ba_{1.95}Cu_3O_7$ and $Y_{1.05}Ba_{1.95}Cu_3O_7$, show interesting features; a marked decrease in resistivity was 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 & Francis
Additional Information: Copyright of this article belongs to Taylor & Francis.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Mar 2008
Last Modified: 27 Aug 2008 13:14
URI: http://eprints.iisc.ac.in/id/eprint/13270

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