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Science 14 October 1988:
Vol. 242. no. 4876, pp. 249 - 252
DOI: 10.1126/science.242.4876.249
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Articles

Bulk Superconductivity up to 122 K in the Tl-Pb-Sr-Ca-Cu-O System

M. A. Subramanian 1, c. c. Torardi 1, J. Gopalakrishnan 1, P. L. Gai 1, J. C. Calabrese 1, T. R. Askew 1, R. B. Flippen 1, and A. W. Sleight 1

1 Central Research and Development Department, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, DE 19880

New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (Tc) of about 85 K is found for (Tl0.5Pb0.5) Sr2CaCu2O7 whereas (Tl0.5Pb0.5)Sr2Ca2Cu3O9 has a Tc of about 120 K. Both materials possess tetragonal symmetry with a = 3.80 Å, c = 12.05 Å for (Tl0.5Pb0.5)Sr2CaCu2O7, and a = 3.81 Å, c = 15.23 Å for (Tl0.5Pb0.5)Sr2Ca2Cu3O9. A structure refinement of the latter phase has been carried out with single-crystal x-ray diffraction data.

Submitted on August 26, 1988
Accepted on September 16, 1988


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Chemistry of High-Temperature Superconductors.
A. W. Sleight (1988)
Science 242, 1519-1527
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Science. ISSN 0036-8075 (print), 1095-9203 (online)