Superconductivity of New Compounds in the Systems Tl-Ln-Sr-Cu-O (Ln=Pr and Nd) and Tl-Pb-Ln-Sr-Cu-O (Ln=Pr, Nd and Sm)
- 1 February 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (2A), L200
- https://doi.org/10.1143/jjap.28.l200
Abstract
Superconductivity of new compounds with the T c at about 40 K in the Tl-Ln-Sr-Cu-O (Ln=Pr and Nd) and the Tl-Pb-Ln-Sr-Cu-O (Ln=Pr, Nd and Sm) systems has been revealed through the temperature dependence of the resistivity and ac susceptibility. Introduction of PbO into the Tl-Ln-Sr-Cu-O system is found to stabilize the superconducting phase. The structure of the material in the Tl-Pb-Ln-Sr-Cu-O system can be regarded as tetragonal, and the composition may be described as (Tl, Pb)(Ln, Sr)2CuO x with the Ln/Sr molar ratio of 0.5.Keywords
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