Interface between gold and superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}
- Department of Chemical Engineering, Materials Science and Mining Engineering, Henry Krumb School of Mines, Columbia University, New York, New York 10027 (United States)
- AFR, Inc., East Hartford, Connecticut 06108 (United States)
Gold (Au) and silver (Ag) are known to be important contact metals on YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (YBCO). Both metals have been used as additives in fabricating tapes of YBCO and {ital Bi}{sub 2}{ital Sr}{sub 2}{ital CaCu}{sub 2}{ital O}{sub 8} (BSCCO) materials, and have favorable results in improving not only the flexibility but also the weighted critical currents of the resulting composites. Previous results on superconductor/normal metal/superconductor junctions made using YBCO/Au/YBCO and YBCO/Au/Nb demonstrated that a supercurrent can be induced in the normal metal layers through the proximity effect. Our transmission electron microscopy study of the Au/YBCO interfaces shows a well-bonded interface with no extraneous phases present. Lattice fringes of the (001) plane in YBCO terminated at the interface abruptly. This observation supports previous results of contact resistance of x-ray photoelectron spectroscopy (XPS). Both (001) integral steps and multiples of 1/3 (001) steps were observed at the Au/YBCO interface. When the top gold layer was absent locally, surface degradation was observed as the (001) lattice fringes stopped short from the surface by 10 nm. Our results support that Au is a desirable contact metal and a dependable surface passivation material for YBCO. {copyright} 1995 Materials Research Society
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG01-90ER81084
- OSTI ID:
- 239351
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 10 Vol. 10; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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