Structure and properties of Tl0.5Pb0.5Sr2Gd2−xCexCu2O9−δ

✍ Scribed by R. Vijayaraghavan; C. Michel; A. Maignan; M. Hervieu; C. Martin; B. Raveau; C.N.R. Rao

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 782 KB
• Volume: 206
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90704-t

✦ Synopsis

A systematic study of the Tlo.sPbo.sSr2Gd2_xCexCu209_6 system has revealed the existence of a pure phase in the compositional range 0.0 < x < 0.6 crystallizing in the 1222 structure. It has an intersheet distance of approximately 6 ]~, a value much higher than those found in other cuprates with double CuO2 sheets interleaved by a single fluorite layer. Superconductivity has been observed in the range 0.1 <x<0.4 with a Tc of 45 K and a superconductive volume fraction up to 20% for the optimal composition. An interesting variation of the superconducting properties of the above system with the composition, i.e. cerium content, has also been noticed. A possible dependence of superconductivity on the coupling between CuO2 sheets in the layered cuprates has been pointed out to bring out a correlation between structure and properties.