Raychaudhuri, AK and Sreedhar, K and Rajeev, KP and Ram, Mohan RA and Ganguly, P and Rao, CNR (1987) High-temperature superconductivity in La- and Lu-substituted YBa2,Cu3,O7, and related oxides. In: Philosophical Magazine Letters, 56 (1). 29 -34.
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The perovskites, Y0.75La0.25Ba2Cu3O7 and Y0.75Lu0.25Ba2Cu3O7, show high-Tc superconductivity (with zero resistance at or above 80 K), just as the parent compound YBa2Cu3O7. The Lu-substituted oxide, with the smallest unit-cell parameters, shows the highest Tc besides exhibiting a 100% Meissner effect. Hc1, in these oxides is around 25 mT, but the Hc2, is large. The thermopower of YBa2Cu3O7 shows a sharp transition to zero at the superconducting transition, reinforcing the bulk nature of the superconductivity. Preliminary studies show that ErBa2Cu3O7 and Er0.5Y0.5Ba2Cu3O7 are both high-temperature superconductors with zero resistance in the 82-90 K range.
| 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 06:44 |
| Last Modified: | 12 Aug 2009 06:44 |
| URI: | http://eprints.iisc.ac.in/id/eprint/20814 |
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