High pressure synthesis and characterization of superconducting YBa2(Cu3-xAux)O7-delta and YSr2(Cu3-xAux)O7-delta

Previous research has shown that Au can substitute for Cu in Ya(2)CU(3)O(7- delta) and only becomes superconducting when Y is doped with Ca. In this st udy, we have investigated the structure-property relationship of Au-doped Y BCO without Ca substitution, and found that the compound system is still su perconducting and has a variable composition range. We have also synthesize d and characterized Au-doped YSr2CU3O7-delta, and found that it too is also superconducting with a variable composition range. Here we report the synt hesis and characterization of these two compound systems and compare and co ntrast their physical properties.