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High-temperature superconductivity in La- and Lu-substituted YBa2,Cu3,O7, and related oxides

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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