Y‐Ba‐Cu‐O thin films prepared by flash evaporation Available to Purchase

Oriented‐Y‐Ba‐Cu‐O thin films with thicknesses between 0.6 and 0.7 μm have been deposited on magnesium oxide substrates by the flash evaporation method. The deposition was made by dropping powders of sintered Y₁ Ba₂ Cu₃ O_7−x onto a resistively heated tungsten boat. The as‐deposited films were then annealed at 930 °C in oxygen for 60 min. Annealed films were superconductors above 77 K and x‐ray diffraction showed a preferred c‐axis orientation. Increasing the annealing temperature to 945 °C improved the texture of the films and the transition temperature of the superconductivity.