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 Tc(R = 0) = 98 K and critical current Jc(77 K)=1.0×105 A/cm2 can be obtained for 2122 phase films, and for 2223 phase films Tc(R = 0) = 115 K and Jc(77 K) = 5.5 × 105 A/cm2 can be obtained.