Superconductivity at 50K in (Pb_0.5Cd_0.5)Sr₂(Lu_xCa_1-x)Cu₂O_z

Superconducting copper oxide (Pb_0.5Cd_0.5)Sr₂(Lu_xCa_1-x)Cu₂O_z has been prepared in oxygen atmosphere. The zero resistivity temperature is 50K for the x=0.5 sample and 43K for the x=0.7 sample. The lattice constants are a=0.3805nm, c=1.2008nm. Phase and superconductivity are discussed in this paper.