Superconductivity near liquid nitrogen temperature in the Pb Sr R Ca Cu O system (R= Y or rare earth)
MA Subramanian, J Gopalakrishnan, CC Torardi… - Physica C …, 1989 - Elsevier
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 Pb 2 Sr 2 (R, Ca) 1 Cu 3 O 8+ y and the structure of the R= Y compound has
been solved by single-crystal X-ray diffraction methods. The structure consists of double
CuO 2 sheets interleaved by (Ca, R), a unit which is common to most of the high-T c copper
oxide superconductors. A new structural feature found in this system is a double Pb O layer …
Sr-R-Ca-Cu-O system where R is Y or rare earth. The superconducting compound has been
identified as Pb 2 Sr 2 (R, Ca) 1 Cu 3 O 8+ y and the structure of the R= Y compound has
been solved by single-crystal X-ray diffraction methods. The structure consists of double
CuO 2 sheets interleaved by (Ca, R), a unit which is common to most of the high-T c copper
oxide superconductors. A new structural feature found in this system is a double Pb O layer …