Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 13 March 1987:
Vol. 235. no. 4794, pp. 1373 - 1376
DOI: 10.1126/science.235.4794.1373
Prev | Table of Contents | Next

Articles

Superconductivity at 40 K in the Oxygen-Defect Perovskites La2-xSrxCuO4-y

J. M. TARASCON 1, L. H. GREENE 1, W. R. MCKINNON 1, G. W. HULL 1, and T. H. GEBALLE 1

1 Bell Communications Research, 331 Newman Springs Road, Red Bank, NJ 07701.

Structural, magnetic, and electronic properties of compounds in the series La2-xSrx CuO4-y for 0.05 le x le 1.1, with dgrx = 0.025, were studied. Resistance, susceptibility, Meissner, and shielding measurements have revealed superconductivity among several members of the series. For x = 0.15, the transition temperature Tc, measured at the midpoint of the resistive transition, is a maximum at 39.3 K with a width of 2 K. At other compositions the transition is broader and occurs at a lower temperature. Annealing the x = 0.15 sample in oxygen at 500°C increases Tc to 40.3 K, while annealing at the same temperature under vacuum suppresses the superconductivity. These changes in oxygen content and Tc are reversible.

Submitted on January 21, 1987
Accepted on February 5, 1987


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Hole Density Dependence of the Critical Temperature and Coupling Constant in the Cuprate Superconductors.
M.-H. Whangbo and C. C. Torardi (1990)
Science 249, 1143-1146
   Abstract »    PDF »
Direct Observation and Analysis of CuO2 Shear Defects in La2-xSrxCuO4.
P. L. Gai and E. M. McCarron III (1990)
Science 247, 553-556
   Abstract »    PDF »
Electronic Structure and Valence-Bond Band Structure of Cuprate Superconducting Materials.
Y. GUO, J.-M. LANGLOIS, and W. A. GODDARD III (1988)
Science 239, 896-899
   Abstract »    PDF »
The Magnon Pairing Mechanism of Superconductivity in Cuprate Ceramics.
G. CHEN and W. A. GODDARD III (1988)
Science 239, 899-902
   Abstract »    PDF »
The Discovery of a Class of High-Temperature Superconductors.
K. A. MULLER and J. G. BEDNORZ (1987)
Science 237, 1133-1139
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)