PREPARATION OF TLCABACUO HIGH-TC SUPERCONDUCTING THIN-FILMS ON LAALO3 SUBSTRATES

Pure 2122 phase and 2223 phase superconducting TlCaBaCuO thin films have been reproducibly prepared on (100)LaAlO3 substrates by dc magnetron sputtering using a pair of superconducting Tl2Ca2B2Cu3O10 targets and post-annealing at different temperatures. X-ray diffraction analysis indicates that the films are highly c-axis oriented perpendicular to the film surface for both types of the thin films. The critical transition temperature T(c)(R = 0) = 98 K and critical current J(c)(77 K) = 1.0 x 10(5) A/cm2 can be obtained for 2122 phase films, and for 2223 phase films T(c)(R = 0) = 115 K and J(c)(77 K) = 5.5 x 10(5) A/cm2 can be obtained.