Superconductivity near liquid nitrogen temperature in the Pb---Sr---R---Ca---Cu---O system (R= Y or rare earth)

Subramanian, M. A. ; Gopalakrishnan, J. ; Torardi, C. C. ; Gai, P. L. ; Boyes, E. D. ; Askew, T. R. ; Flippen, R. B. ; Farneth, W. E. ; Sleight, A. W. (1989) Superconductivity near liquid nitrogen temperature in the Pb---Sr---R---Ca---Cu---O system (R= Y or rare earth) Physica C: Superconductivity, 157 (1). pp. 124-130. ISSN 0921-4534

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/092145...

Related URL: http://dx.doi.org/10.1016/0921-4534(89)90477-2

Abstract

Superconductivity close to the boiling point of liquid nitrogen has been discovered in the P-Sr-R-Ca-Cu-O system where R is Y or rare earth. The superconducting compound has been identified as Pb2Sr2(R,Ca)1Cu3O8+y and the structure of the R=Y compound has been solved by single-crystal X-ray diffraction methods. The structure consists of double CuO2 sheets interleaved by (Ca,R), a unit which is common to most of the high-Tc copper oxide superconductors. A new structural feature found in this system is a double Pb---O layer separated by a sheet of copper atoms. A non-superconducting oxide of approximate composition (Y,Ca)Sr2(Cu,Pb)3O7-y formed as a second phase in some preparations has been also characterized; its structure is related YBa2Cu3O7.

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