Epitaxial Tl2Ba2CaCu2O8 superconducting thin film on Sr2(AlTa)O6 buffer layer

Epitaxial Tl2Ba2CaCu2O8 superconducting films have been successfully grown on the dielectric Sr2(AlTa)O6 (SAT) buffer layers. X-ray diffraction data showed that the films were highly c-axis oriented with a rocking curve full width half maximum as narrow as 0.3°. The films also had an excellent in-plane epitaxy with Tl2Ba2CaCu2O8[100] aligned with SAT[100] and MgO[100] of the substrate. The zero resistance temperature Tc of the superconducting films ranged from 95 to 103 K and the transport critical current density Jc in zero field was 3×105 A/cm2 at 77 K.