Epitaxial growth of YBCO thin films on Al2O3substrates by pulsed laser deposition

摘要

Superconducting YBa2Cu3O7-δ (YBCO) thin films were deposited on CeO2 buffered Al2 O3 (alumina and sapphire) substrates by pulsed laser deposition. Superconducting properties of the c-axis YBCO films on these substrates were greatly affected by the growth orientation of CeO2 buffer layer. The critical temperature of YBCO film on alumina substrate was ~83 K. In the case of single crystal substrates, the critical temperature of YBCO thin film was ~89.5 K, and the critical current density was 1.5×106 A/cm2 at 77 K