High temperature superconducting films and multilayers for electronics. Annual report, 21 February 1992-20 February 1993

Technical Report · Sat Feb 20 04:00:00 EST 1993

OSTI ID:6276279

Gavaler, J R; Talvacchio, J

Progress is reported on four tasks which address problems fundamental to the understanding of the superconducting state in HTS films, the application of HTS films in passive microwave circuits, the realization of HTS digital electronics, and the development of new superconducting devices. An anti-correlation between critical temperature an normal state resistivity was observed at certain compositions in the YBCO, LSCO, and BKBO systems. The criticality of optimizing both oxidation steps involved in YBCO growth to obtain low rf surface resistances was demonstrated. A new insulating material, Sr-Al-Ta-0 (SAT), was developed as an epitaxial insulator in multilayer YBCO circuits to replace Sr-Ti-O. The dc resistivity and surface morphology were as good as those of Sr-Ti-O while the real and imaginary parts of the dielectric constant were greatly superior. Systematic studies were made of the processing parameters for step-edge S-N-S YBCO Josephson junctions. The critical parameters for junction reproducibility were found to be a step angle of approximately 15 deg and a high-conductivity normal-metal barrier. All-BKBO tunnel junctions were demonstrated with Sr-Ti-O tunnel barriers which exhibited a superconducting gap structure to within 2K of the transition temperature of the BKBO electrodes. Epitaxial Sr-Ti-O films were also used as buffer layers to permit single-orientation BKBO films to be grown on practical La-Al-0 or Nd-Ga-0 substrates. ... Superconductors, Yttrium, Barium, Copper, Oxides, High, Critical, Temperature, Thin films, Tunneling, Barriers, Sputtering.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center
• OSTI ID: 6276279
• Report Number(s): AD-A-264410/2/XAB; CNN: F49620-91-C-0034
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CUPRATES
DIGITAL SYSTEMS
DOCUMENT TYPES
FABRICATION
FILMS
HIGH-TC SUPERCONDUCTORS
INTERMETALLIC COMPOUNDS
JOSEPHSON JUNCTIONS
JUNCTIONS
MICROELECTRONICS
OXIDES
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PHYSICAL PROPERTIES
PROGRESS REPORT
REFRACTORY METAL COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
SURFACE PROPERTIES
TANTALATES
TANTALUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES