CHARACTERIZATION OF THIN-FILM COMPOSITE MIXTURES OF Y1BA2CU3O7-DELTA AND Y2O3

In our studies of the behavior of materials forming thin film composites with Y1Ba2Cu3O7-delta(YBCO), we have characterized thin film composite mixtures of YBCO and Y2O3 (Yttria) grown onto (100) MgO and (100) SrTiO3 substrates by off-axis sputtering. We have examined the transport properties of the films, in particular the critical current density, J(c). The temperature dependence of J(c) for composites on SrTiO3 is identical to that of our pure YBCO films, while for composites on MgO the 3, is similar to measurements on our earlier composites of YBCO and Y2Ba1Cu1O5 (''211''), The field dependence of J(c) for the YBCO/Yttria composites is different from our pure YBCO films, and from our earlier composites, but the magnitude of the flux pinning is similar.