Superconducting electronic-film structures. Semiannual report, 1 January-30 June 1988
Modification in Y-Ba-Cu-O growth procedures were instituted to eliminate non-superconducting near-surface layers observed in films. These include much higher ramp rates to the 850 C crystallization temperature of the as-deposited amorphous films and the use of an entirely in-situ processing. Films have now been grown that are superconducting up to the surface. Other Y-Ba-Cu-O films have been sputtered which are crystalline (tetragonal) as-deposited. These films. Gold layers deposited at room temperature on recent films were found to have contact resistance less than the limit of the apparatus sensitivity. Evidence for crystallinity and epitaxy was found in 10 nm YBCO films deposited at 650 C from the vapor phase. Measurements on superconducting resonator cavities have begun using epitaxial films on SrTiO3 substrates. Thin epitaxial MgO layers were grown on sapphire to eventually provide a better substrate for this application. Y-Ba-Cu-O/MgO/Nb tunnel junctions were fabricated. Non-continuous barrier layer produced superconducting shorts in the junctions. This result, however, provided the non-ambiguous evidence that the new growth procedures had produced films that were superconducting up to the surface.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
- OSTI ID:
- 6521400
- Report Number(s):
- AD-A-200534/6/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CUPRATES
COPPER COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT
YTTRIUM COMPOUNDS
CAVITY RESONATORS
CERAMICS
ELECTRONIC EQUIPMENT
GOLD
JUNCTIONS
LAYERS
MAGNESIUM OXIDES
NIOBIUM
PROCESSING
PROGRESS REPORT
SAPPHIRE
SENSITIVITY
STRONTIUM TITANATES
SUBSTRATES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CORUNDUM
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FILMS
MAGNESIUM COMPOUNDS
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESONATORS
STRONTIUM COMPOUNDS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
420201* - Engineering- Cryogenic Equipment & Devices
360204 - Ceramics
Cermets
& Refractories- Physical Properties