Pulsed laser deposition of thin superconducting films of Ho/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/
Thin films of Ho/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ were deposited on SrTiO/sub 3/ and Al/sub 2/O/sub 3/ substrates by pulsed laser deposition of high-T/sub c/ bulk superconductor pellets in vacuum. Following annealing in O/sub 2/ at 800--900 /sup 0/C the films were superconducting with typical T/sub c/ (50%) = 89 K and transition widths of 10 K. Rutherford backscattering spectrometry (RBS) and secondary ion mass spectrometry (SIMS) were utilized to study the stoichiometry of the as-deposited films for laser energy densities between 0.11 and 4.5 J cm/sup -2/. The films were deficient in holmium and yttrium for energy densities below 0.6 and 0.4 J cm/sup -2/, respectively. The films were stoichiometric for fluences above 0.6 J cm/sup -2/. In addition, preliminary time dependence and spectroscopic observations of the laser-produced plasma are presented. The results indicate an ablation mechanism that at high energy densities preserves stoichiometry. TEM and x-ray characterization of annealed, superconducting Ho/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ films on (100) SrTiO/sub 3/ showed mixed regions of epitaxially oriented 1:2:3 material with either the c axis or a axis oriented along the surface normal. The a-axis-oriented material grew preferentially in the films with b, c, twinning. Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/
- Research Organization:
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056
- OSTI ID:
- 6747041
- Journal Information:
- J. Mat. Res.; (United States), Vol. 3:6
- Country of Publication:
- United States
- Language:
- English
Similar Records
Highly oriented as-deposited superconducting laser ablated thin films of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub delta/ on SrTiO/sub 3/, zirconia, and Si substrates
High-temperature superconductivity in ultrathin films of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
DEPOSITION
MICROSTRUCTURE
STOICHIOMETRY
COPPER OXIDES
HOLMIUM OXIDES
YTTRIUM OXIDES
CHEMICAL COMPOSITION
LASER RADIATION
LASER SPECTROSCOPY
SUBSTRATES
SUPERCONDUCTING FILMS
VACUUM EVAPORATION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
EVAPORATION
FILMS
HOLMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADIATIONS
RARE EARTH COMPOUNDS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656100 - Condensed Matter Physics- Superconductivity