Title :
(Pb,Cu)Sr2(Y,Ca)Cu2Oz, new superconducting layered copper oxides
Author :
Sakuyama, Kazuhiro ; Maeda, Toshihiko ; Koriyama, Shin-ichi ; Yamauchi, H. ; Tanaka, Shoji
Author_Institution :
Superconductivity Res. Lab., ISTEC, Tokyo, Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
Single-phase ceramics of Pb-based layered copper oxides, (Pb(1+x)/2Cu(1-x)/2)Sr2(Y1-x Cax)Cu2Ox (x=0~0.35), were successfully synthesized in an oxidizing atmosphere in contrast to the case of Pb2Sr2(Y,Ca)Cu3O8. Superconductivity is observed for the samples containing appropriate amounts of Ca such that x>0.25 when annealed in air and then quenched into liquid nitrogen. As the Ca content, x, increases, the superconductivity transition temperature increases. The superconducting onset temperature of 65 K is measured for the multiphase samples with x=0.5
Keywords :
annealing; calcium compounds; ceramics; high-temperature superconductors; lead compounds; quenching (thermal); strontium compounds; superconducting transition temperature; yttrium compounds; (Pb(1+x)/2Cu(1-x)/2)Sr2(Y 1-xCax)Cu2Ox; 65 K; annealing; high temperature superconductors; multiphase samples; oxidizing atmosphere; quenching; single-phase ceramics; superconducting layered copper oxides; superconducting onset temperature; superconductivity transition temperature; Annealing; Ceramics; Copper; Electric resistance; Lead; Powders; Superconducting epitaxial layers; Superconducting transition temperature; Superconductivity; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
