| Literature DB >> 17787652 |
M A Subramanian, C C Torardi, J Gopalakrishnan, P L Gai, J C Calabrese, T R Askew, R B Flippen, A W Sleight.
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.Entities:
Year: 1988 PMID： 17787652 DOI： 10.1126/science.242.4876.249
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728