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 laser 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 conditions for a c-textured growth. Particular attention was paid to the special features of metallic substrates as oxidation, surface roughness, and rolling texture. X-ray diffraction experiments and resistance measurements were performed in order to study the texture and the superconducting properties of the films. For a substrate temperature of 750-degrees-C and an oxygen partial pressure of 0.3 mbar a superconducting transition temperature of 89 K (midpoint) was obtained.