Effect of Hole Density on Superconductivity in the Nd-Ce-Sr-Cu-O System
- 1 May 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (5A) , L810
- https://doi.org/10.1143/jjap.28.l810
Abstract
Superconductivity of a solid solution with the composition of (Nd0.8-x Ce x Sr0.2)2CuO y was investigated. This phase is a prototype superconductor which has single-layered CuO square-pyramidal unit. A single-phased sample was obtained in a narrow range of Ce content, 0.0875≤x≤0.1500. Oxygen content and Ce valence were determined by two kinds of coulometric titration techniques. The results show that all samples have oxygen vacancies and that Ce is tetravalent. The critical temperature rises with an increase in hole density, which is determined by titration.Keywords
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