Synthesis and properties of TlBaCaCuO films prepared by spray pyrolysis method

The authors report on the fabrication, characterization, and transport properties of TlBaCaCuO (TBCCO) high-T/sub c/ superconducting films made from a low-cost, simple spray pyrolysis technique. This technique is applicable to the fabrication of large-area films for the design and fabrication of conformal superconducting coatings and large-area microwave devices. A high annealing temperature, close to the melting point of TBCCO, is needed in order to eliminate flaws, voids, and cracks. Measurements on the films showed relatively modest critical current densities. There was significant improvement in the critical current density by using an annealing temperature of approximately 895 degrees C. At this temperature, the material melted partially and showed improved surface morphology.< >