Early stages of YBa sub 2 Cu sub 3 O sub 7 minus. delta. epitaxial growth on MgO and SrTiO sub 3
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6123 (United States)
- Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6123 (United States)
The initial stages of epitaxial growth of {ital c}-axis-perpendicular laser-ablated YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (YBCO) thin films on SrTiO{sub 3} and MgO substrates were studied by scanning tunneling microscopy. Surface images of films grown on SrTiO{sub 3} with a sequential thickness variation reveal a transition from layerlike to island growth between 8 and 16 unit cells thickness, i.e., YBCO grows on SrTiO{sub 3} by a Stranski-Krastanov mechanism. Evidence also points to the existence of a slightly larger critical thickness for the introduction of screw dislocations into those films. In contrast, even the thinnest ({similar to}8 cells thick) YBCO films were found to grow on MgO by an island mechanism, with screw-growth features clearly present.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7293151
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:13; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ABLATION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
EPITAXY
FILMS
HEATING
HIGH-TC SUPERCONDUCTORS
LASER-RADIATION HEATING
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PLASMA HEATING
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
SURFACE PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES