Optimization of annealing temperature for YBa2Cu3O7 thin films post-annealed at a low oxygen partial pressure
Abstract
Post-annealing of YBa2Cu3O7 (YBCO) thin films is usually performed at 850-900 C in atmospheric-pressure oxygen. In this study, coevaporated YBCO films on LaAlO3 were post-annealed in an oxygen partial pressure of 29 Pa at temperatures in the range 700-825 C. Zero resistance transition temperatures were 89-90 K. Both dc (room-temperature resistance and critical current density) and ac parameters (extracted from eddy-current response measurements at 25 MHz) were monitored. The optimum temperature is close to 750 C, which is on the YBCO thermodynamic stability line at this low oxygen partial pressure.
- Publication:
-
Journal of Superconductivity
- Pub Date:
- August 1991
- DOI:
- Bibcode:
- 1991JSup....4..279M
- Keywords:
-
- Annealing;
- High Temperature Superconductors;
- Optimization;
- Superconducting Films;
- Temperature Dependence;
- Thin Films;
- Yttrium Oxides;
- Aluminum Oxides;
- Copper Oxides;
- Electrical Properties;
- Evaporation;
- Lanthanum Oxides;
- Oxygen Tension;
- Substrates;
- Thermal Stability;
- Transition Temperature;
- Solid-State Physics