Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-01-15
1993-01-12
Lusignan, Michael
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505706, 427 62, 427125, B05D 512
Patent
active
051790718
ABSTRACT:
A high-T.sub.c superconductor contact unit having low interface resistivity is disclosed, as is a method for making the unit. An inert metal is deposited on the surface of the superconductor, which surface is preferably non-degraded, to form a unit with the surface of the superconductor, and where temperatures as high as 500.degree. C. to 700.degree. C. can be tolerated, the unit is oxygen annealed to establish a still lower surface resistivity between the surface of the high-T.sub.c superconductor and the inert metal, including a low surface resistivity of about 10.sup.-10 .OMEGA.-cm.sup.2 at high-T.sub.c superconductor operating temperatures. The superconductor is a metal-oxide superconductor, and may be rare earth, thallium, or bismuth based.
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Tzeng et al., "High Performance Silver Ohmic Contacts to YBa.sub.2 Cu.sub.3 .sub.6+X Superconductors", Appl. Phys. Lett. 52(2) Jan. 1988 pp. 155-156.
Sugimoto et al., "Low Resistance Ohmic Contact for the Oxide Superconductor Eu Ba.sub.2 Cu.sub.3 O.sub.2 y," Jpn. J. Appl. Phys. 27(5) May 1988 pp. 864-866.
Van der Maas et al., Nature vol. 328, Aug. 13, 1987, pp. 603-604.
McCallum et al. "Problems In the Production of YB.sub.a 2Cu.sub.3 O.sub.x Superconducting Wire", Advanced Ceramic Materials-Ceramic Superconductors, vol. 2, No. 33 (Jul. 1987) pp. 388-400.
Wu et al. "Epitaxial ordering of oxide superconductor thin films on (100) SrTiO.sub.3 prepared by pulsed laser evaporation", Applied Physics Letters, vol. 51, No. 11 (Sep. 1987) pp. 861-863.
Ginley et al., "Grain Boundary Superconductivity in the YBaCuO System", MRS Conf. on High T.sub.c Superconductors, Apr. 23-24, 1987, pp. 201-204.
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Blankenship Betty A.
Ekin John W.
Panson Armand J.
King Roy V.
Lusignan Michael
The United States of America as represented by the Secretary of
Westinghouse Electric Corp.
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