Superconductivity And Ferroelectricity Of Pb(Zr,Ti)O-3/Yba2cu3o7 Integrated Films

The superconductivity, ferroelectricity and dielectric properties of Pb(Zr,Ti)O-3/YBa2Cu3O7 integrated films fabricated by the DC/RF magnetron sputtering method have been investigated. The integrated films are homogeneous and epitaxially grown on the substrate. In a relatively broad band, from 120 to 10 kHz, the dielectric loss at 77 K was low. The PZT film exhibited saturation and remanence polarizations of 40 and 25 mu C/cm(2), respectively and a coercive field of 98 kV/cm. The zero resistance temperature T-c0 did not decrease after an overlayer PZT was deposited onto the YBCO layer. But the T-c0 was degraded when an ultrathin YBCO layer was used in the heterostructure and further degraded by ion milling.