Abstract
The reoccurrence of pits has been found on the surfaces of c-axisYBa2Cu3O7-δ (YBCO) films grown epitaxially on10°vicinal SrTiO3 substrates by pulsed laser deposition. They are alwaysassociated with films with a step-terrace structure, whilepolycrystalline films have no pits. Pit formation is attributed to thelarge interfacial stress induced by vicinal substrate and oxygendeficiency of the YBCO film during the tetragonal-to-orthorhombic(T-O) phase transition, which cannot be released by forming twins,and leads to rupturing of the film surface. By reducing the oxidationpartial pressure for the T-O phase transition to 80 Pa, no pits were formed,and the YBCO film is superconducting at 60 K. PACS: 62. 20. Hk, 74. 76. Bz, 81. 15.
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