PREPARATION OF HIGH-TC AND JC FILMS OF BA2YCU3O7 USING LASER EVAPORATION OF A COMPOSITE TARGET CONTAINING BAF2

[[abstract]]High Tc and Jc superconducting films of Ba2YCu3O7 are prepared on SrTiO3 〈100〉 substrates using pulsed excimer laser evaporation of a composite target containing BaF2, Y2O3, and CuO, followed by annealing in wet oxygen. High transition temperatures (R=0 from 89.5 to 91 K) and high critical current densities (Jc≥7×105 A cm−2) are obtained. The electrical transport properties of these films are significantly better than films previously grown via laser ablation of Ba‐Y‐Cu‐O targets.[[fileno]]2010113010069[[department]]物理