Influence of deposition rate on the properties of thick YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films
- Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
To investigate potential limits to the rate at which high-quality YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} can be deposited, we have produced a series of 1 {mu}m thick films by pulsed laser deposition on single-crystal SrTiO{sub 3} substrates at average rates ranging from 2 {Angstrom}/s to 240 {Angstrom}/s. The critical current density of low-rate films was over 2MA/cm{sup 2} at 75 K, self field, but dropped linearly with rate to about 1MA/cm{sup 2} at the upper end of the range. In addition, the superconducting transition temperature, resistivity above the transition, and performance in an applied magnetic field were all degraded by increasing the deposition rate. A change in c-axis lattice parameter suggests that possible causes for this degradation are oxygen deficiency or cation disorder with the latter being the more likely. Annealing high-rate films at 790{degree}C for as little as 20 min improved critical current density to within 20{percent} of low-rate values, and resulted in dramatic improvements in other film properties as well. {copyright} {ital 1997 Materials Research Society.}
- OSTI ID:
- 573758
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 11 Vol. 12; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
Similar Records
Preparation of YBa sub 2 Cu sub 3 O sub 7 minus. delta. thin films by magnetron sputtering with in situ plasma oxidation
Epitaxial growth and properties of YBa sub 2 Cu sub 3 O sub 7 minus. delta. /NdGaO sub 3 /YBa sub 2 Cu sub 3 O sub 7 minus. delta. trilayer structures