Crystallochemical Studies on the High Temperature Superconductors La2-xMxCuO4-y (M=Ba and Sr)
- 1 April 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (4A) , L484-487
- https://doi.org/10.1143/jjap.26.l484
Abstract
High temperature superconductors La2-x M x CuO4-y (M=Ba and Sr) with the K2NiF4 structure were synthesized by solid state reaction and characterized by X-ray diffraction, electron microscopy, IR measurements and thermogravimetry. Anomalous behavior of unit cell parameters was confirmed. Electron diffraction study of the orthorhombic La2CuO4 revealed weak forbidden spots for Fmmm symmetry, suggesting a space group of lower symmetry. One of three IR bands observed in La2CuO4 rapidly disappeared around x=0.1. Highest superconducting transition temperature was found to be 38.0 K in La1.85Sr0.15CuO3.96.Keywords
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