Abstract
The effects of varying the temperature and duration of the post-deposition anneal in watersaturated oxygen were investigated for YBa 2Cu 3O 7−δ films of varying thickness. The films were produced by laser ablation from pressed powder targets consisting of BaF 2,Y 2O 3, and CuO mixtures. This technique produces superconducting films with a highly textured surface. The films were fabricated on SrTiO 3 substrates and were analyzed with X-ray diffraction, scanning electron microscopy, and temperature dependent resistivity. Critical current density ( J c) measurements were performed in magnetic fields up to 1 T. For film thickness on the order of 900 nm, completely c-axis oriented films were obtained with a 60 min anneal at 850°C. Thinner films required less annealing, either shorter times or lower temperatures, to achieve similar results, indicating that the optimal annealing conditions are dependent on film thickness.
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