NEW HIGH-TC SUPERCONDUCTOR - (IN,PB,CU)SR2(CA,Y)CU2O7-DELTA

Bulk superconductivity was observed in the new system (In xPb0.75-xCu0.25)Sr2(Ca 0.5Y0.5)Cu2 O7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature Tc from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a d...