Bulk superconductivity up to 122 K in the Tl-Pb-Sr-Ca-Cu-O system
- Subramanian, M. A.
- Torardi, C. C.
- Gopalakrishnan, J.
- Gai, P. L.
- Calabrese, J. C.
- Askew, T. R.
- Flippen, R. B.
- Sleight, A. W.
Publication date
October 1988
DOI Publisher
American Association for the Advancement of Science (AAAS)Abstract
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
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