A new superconductor in lead cuprate (Pb0.5B0.5)Sr-2(Y0.5Ca0.5)Cu2Py

A new lead cuprate superconductor, (Pb0.5Ba0.5)Sr-2(Y0.5Ca0.5)Cu2Oy, With T-c(onset)=62 K and T-c(zero)=31 K, has been prepared. Barium ions occupy the part sites of the lead in the unit cell. The crystal parameters of this superconductor are a=3.82 Angstrom, c=11.93 Angstrom. For one of the samples, an anomalous drop of resistance was observed around 230 K, but it disappeared after 4 thermocycles.Physics, AppliedSCI(E)EI