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Superconducting Properties of Substituted Oxides Bi2Sr2−xLaxCuO6+y and Bi2Sr2Ca1−xYxCu2O8+y Neutron Diffraction of Bi2Sr1.6La0.4CuO6+y and Bi2CaLaCuO6+y

Published online by Cambridge University Press:  21 February 2011

J. Darriet ,
J. A. Alonso ,
P. Burlet ,
B. Chevalier ,
B. Lepine ,
J. Rossat-Mignod ,
C. J. P. Soethout ,
J. L. Soubeyroux  and
J. Etourneau
J. Darriet
Affiliation:
Laboratoire de Chimie du Solide du CNRS,351, Cours de la Libération,33405 Talence Cedex France.
J. A. Alonso
Affiliation:
Ceng, DRF SPh-MDN, B.P.85 X, 38041 Grenoble Cedex France.
P. Burlet
Affiliation:
Ceng, DRF SPh-MDN, B.P.85 X, 38041 Grenoble Cedex France.
B. Chevalier
Affiliation:
Laboratoire de Chimie du Solide du CNRS,351, Cours de la Libération,33405 Talence Cedex France.
B. Lepine
Affiliation:
Laboratoire de Chimie du Solide du CNRS,351, Cours de la Libération,33405 Talence Cedex France.
J. Rossat-Mignod
Affiliation:
Ceng, DRF SPh-MDN, B.P.85 X, 38041 Grenoble Cedex France.
C. J. P. Soethout
Affiliation:
Gorlaeus Laboratories, Leiden University, P.O.BOX 9502, 2300RA LEIDEN,The Netherlands.
J. L. Soubeyroux
Affiliation:
ILL, B.P. 156X, 38042 Grenoble Cedex France.
J. Etourneau
Affiliation:
Laboratoire de Chimie du Solide du CNRS,351, Cours de la Libération,33405 Talence Cedex France.
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Abstract

The substituted oxides Bi2Sr2−xLaxCuO6+y and Bi2Sr2Ca1−xYxCu2O8+y isostructural to the n = 1 and n = 2 members of the high Tc superconductors have been prepared. The solid solution Bi2Sr2−xLaxCuO6+y shows a superconducting transition for 0.2–0.25<x<0.5 with an onset Tc near 30K and zero resistance temperatures which depend on x and the heat treatment. For x = 1 the isostructural phases Bi2ALaCuO6.5+y with A = Ca or Ba have also been synthesized and are not superconducting. A modelfor the localization of the oxygen atoms is proposed based on neutron diffraction of Bi2Sr1.6La0.4CuO6+y and Bi2CaLaCuO6+y.

The Bi2Sr2Ca1−xYxCu2O8+y solid solution exhibits a superconducting transition for 0<x <0.7. The critical temperature remains almost constant (85–90K) for 0<x <0.3 and then decreases rapidly. The oxygen content value 8.65 for Bi2Sr2YCu2O8+y agrees well with the increase of the positive charge when calcium is replaced by yttrium.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 257
Copyright
Copyright © Materials Research Society 1989

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References

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