Bulk Superconductivity up to 122 K in the Tl-Pb-Sr-Ca-Cu-O System
M.A. Subramanian(DuPont (United States)), C.C. Torardi(DuPont (United States)), J. Gopalakrishnan(DuPont (United States)), Pratibha L. Gai(DuPont (United States)), J. C. CALABRESE(DuPont (United States)), T.R. Askew(DuPont (United States)), R. B. Flippen(DuPont (United States)), A.W. Sleight(DuPont (United States))
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Abstract
New high-temperature superconductors based on oxides of thallium and copper, but not containing barium, have been prepared. A transition temperature (T(c)) of about 85 K is found for (Tl(0.5)Pb(0.5)) Sr(2)CaCu(2)O(7) whereas (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9) has a T(c) of about 120 K. Both materials possess tetragonal symmetry with a = 3.80 A, c = 12.05 A for (Tl(0.5)Pb(0.5))Sr(2)CaCu(2)O(7), and a = 3.81 A, c = 15.23 A for (Tl(0.5)Pb(0.5))Sr(2)Ca(2)Cu(3)O(9). A structure refinement of the latter phase has been carried out with single-crystal x-ray diffraction data.
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