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Deposition and in situ oxygen annealing of YBa2Cu3O7-δ (YBCO) thin films with 〈110 〉 perpendicular to the plane of the film were systematically studied for the detailed structure and superconducting properties of the films. The films were grown on SrTiO3 (110) crystals with PrBa2Cu3O7-δ (110) (PrBCO) buffer layer by pulsed laser deposition, and afterwards in situ annealed in normal O2 pressure at different temperatures between 550°C and 925°C. It was found that superconducting properties cannot be induced in the (110) oriented phase with annealing; instead high-temperature annealing rearranged some of the material in the films to (103) and (001) orientations, which were found partly superconducting even at 90 K.
Date of Publication: June 2013