TlBaCaCuO and YBaCuO Superconductor Thin Films via an Electrodeposition Process

Thin-film superconductors of TIBaCaCuO (TBCCO) and YBaCuO (YBCO) were fabricated via an electrodeposition process. The precursors of the superconducting TBCCO films were codeposited at a constant potential of —4 V onto a silver-coated SrTiO3substrate. The YBCO precursors also were codeposited but under pulsed-potential conditions (in order to improve the film morphology) and onto a silver-coated MgO substrate. The pulsed-potential cycle consisted of 1 s at —4 V followed by 1 s at —1 V. The post-annealed TBCCO film showed zero resistance at about 102 K and critical current density at 76 K of 20000 A/cm2 in zero magnetic field and 5000 A/cm2 in a 10 kOe field parallel to the film plane. The post-annealed YBCO film showed zero resistance at approximately 80 K and critical current density of 5160 A/cm2 at 4 K in zero magnetic field.