Thick sol-gel derived YBa2Cu3O7-delta films

YBa2Cu3O7-delta films have been prepared by spin-coating solutions of metal acetates dissolved in trifluoroacetic acid/methanol and trifluoroacetic ac id/isopropanoyl/1,3 propanediol onto LaAlO3 (100) substrates. By using a ra pid, low pO(2) pyrolysis process, high-quality diol films (0.25 mum thick) with J(c) values as high as 14 MA/cm(2) and 2 MA/cm(2) at 7 K and 77 K, res pectively, were fabricated in one tenth the time, compared to conventional processing schemes. The effect of multicoating, in order to reach YBCO film thicknesses of 1.5 mum, on the J(c) was also studied.