CONDITIONS FOR THE TEXTURED GROWTH OF Y-BA-CU-O FILMS ON ZR FOILS

Y1Ba2Cu3Oy films were grown in situ on oxidized Zr foils by pulsed las er ablation. The substrate temperature and the oxygen partial pressure were varied from 500-degrees-C to 800-degrees-C and between 0.01 mbar and 1 mbar, respectively, in order to determine the optimum condition s for a c-textured growth. Particular attention was paid to the specia l features of metallic substrates as oxidation, surface roughness, and rolling texture. X-ray diffraction experiments and resistance measure ments were performed in order to study the texture and the superconduc ting properties of the films. For a substrate temperature of 750-degre es-C and an oxygen partial pressure of 0.3 mbar a superconducting tran sition temperature of 89 K (midpoint) was obtained.