Low-temperature formation of YBa2Cu3O7 - x superconducting films from molecular Cu-Ba-Y precursors
Abstract
Highly oriented superconducting YBa2Cu3O7-x films were prepared on (100) LaAlO3 and (100) yttria-stabilized ZrO2 (YSZ) substrates by sequential thermolysis and oxidation of Cu-Ba-Y μ-oxo alkoxide precursor films at 730 °C. The precursor films were deposited by standard spin-coating techniques. The electrical properties and surface morphology of the YBa2Cu3O7-x films are determined primarily by the thermolysis conditions. YBa2Cu3O7-x films processed at 730 °C show metallic behavior in the normal state and sharp resistive superconducting transitions with Tc (R=0) at 89.5 K. Critical current densities of 2×105 A/cm2 at 77 K were obtained with YBa2Cu3O7-x films on YSZ substrates. X-ray diffraction analysis shows a preferential c-axis alignment normal to the substrate plane.
- Publication:
-
Applied Physics Letters
- Pub Date:
- March 1992
- DOI:
- 10.1063/1.107298
- Bibcode:
- 1992ApPhL..60.1384R
- Keywords:
-
- Copper Oxides;
- High Temperature Superconductors;
- Mixed Oxides;
- Superconducting Films;
- Thermal Decomposition;
- Yttrium Oxides;
- Barium Oxides;
- Electrical Properties;
- X Ray Diffraction;
- Solid-State Physics