Abstract
The reoccurrence of cracks have been found on the surfaces of epitaxial c-axis YBa2Cu3O7-δ (YBCO) films grown on the vicinal SrTiO3 substrates by pulsed laser deposition. At an optimum oxygen annealing condition, there are always cracks on the step-terrace surface of the YBCO films. Crack formation is attributed to the confinement of {110} mirror twinning induced by the anisotropic vicinal interfacial strain and the stress induced by the tetragonal-to-orthorhombic(T-O) phase transition of YBCO film. By use of vicinal SrTiO3 substrates of with small tilting angle(1°−3°) from (001) toward [010] and reduction of the oxidation pressure to 80Pa for T-O phase transition YBCO films with smooth surface was formed, but the films are superconducting at 60K.
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