High Temperature Superconducting Films and Multilayers for Electronics
Annual rept. 20 Feb 1991-20 Feb 1992,
WESTINGHOUSE SCIENCE AND TECHNOLOGY CENTER PITTSBURGH PA
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The four tasks of this three-year program address properties fundamental to 1 enhancing the superconducting properties of HTS films, 2 the application of HTS films in passive microwave circuits, 3 the realization of HTS digital electronics, and 4 the development of new superconducting devices. Progress during the first year included significant enhancements in the properties of superconducting YBCO films. One of these, the elimination of surface roughness due to Cu. particles, was essential for the subsequent growth of high quality multilayer structures. For the first time, uniform large-area YBCO films were sputtered on both sides of a substrate with properties equal or superior to those of single-sided smaller-area films. Two new device configurations were developed the integration of a ferroelectric film on a YBCO electrode compatible with ferroelectric memory cells and a step-edge S-N-S josephson junction using in-situ deposited gold as the normal metal. SQUIDs fabricated with such junctions had the highest yield of any HTS junction configuration. Epitaxial superconducting Ba-K-Bi-O films were deposited and the gap energy was measured as a function of temperature in low-leakage S-I-N tunnel junctions. Epitaxial YBCOinsulatorYBCO trilayers using Sr-Ti-O and La-Al.
- Electrical and Electronic Equipment
- Electricity and Magnetism