SUPERCONDUCTIVITY AND FERROELECTRICITY OF PB(ZR,TI)O-3 YBA2CU3O7 INTEGRATED FILMS/

The superconductivity, ferroelectricity and dielectric properties of P b(Zr,Ti)O-3/YBa2Cu3O7 integrated films fabricated by the DC/RF magnetr on sputtering method have been investigated. The integrated films are homogeneous and epitaxially grown on the substrate. In a relatively br oad 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 2 5 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 wa s deposited onto the YBCO layer. But the T-c0 was degraded when an ult rathin YBCO layer was used in the heterostructure and further degraded by ion milling.