Thick sol-gel derived YBa/sub 2/Cu/sub 3/O/sub 7-δ/ films

Abstract

YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films have been prepared by spin-coating solutions of metal acetates dissolved in trifluoroacetic acid/methanol and trifluoroacetic acid/isopropanol/1,3 propanediol onto LaAlO/sub 3/[100] substrates. By using a rapid, low pO/sub 2/ pyrolysis process, high-quality diol films (0.25 /spl mu/m thick) with J/sub c/ values as high as 14 MA/cm/sup 2/ and 2 MA/cm/sup 2/ at 7 K and 77 K, respectively, 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 /spl mu/m, on the J/sub c/ was also studied.