AU YBA2CU3O7-DELTA THIN-FILM COMPOSITES ON VARIOUS SUBSTRATES/

We have grown a series of composite films of Au with YBa2Cu3O7-delta o n various substrates using a bilayer deposition technique to study the ir suitability for flux flow applications. The T-c's and J(c)'s were m easured, and results compared with plain YBCO films for the different substrates. The patterning process resulted in some damage to the comp osites, but an oxygen plasma treatment was effective in restoring T-c' s and resistance ratios, J(c) measurements suggest that Au/YBCO compos ites behave like SNS-coupled arrays of superconducting grains. Their i ncreased response to small magnetic fields is consistent with Josephso n vortices dominating the transport. These findings indicate that Au/Y BCO composites are a promising material for flux flow applications.