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.
Full text not available from this repository. (Request a copy)Abstract
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 |
|---|---|
| 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.ernet.in/id/eprint/13270 |
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