High-temperature superconductivity in La- and Lu-substituted YBa2,Cu3,O7, and related oxides
- 1 July 1987
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Letters
- Vol. 56 (1) , 29-34
- https://doi.org/10.1080/09500838708205245
Abstract
The perovskites, Y0.75La0.25Ba2Cu3O7 and Y0.75Lu0.25Ba2Cu3O7, show high-T c 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 T c besides exhibiting a 100% Meissner effect. H c1, in these oxides is around 25 mT, but the H c2, 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.Keywords
This publication has 4 references indexed in Scilit:
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