Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Substrate for supporting superconductor
Patent
1995-06-07
1999-01-26
King, Roy V.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Substrate for supporting superconductor
505220, 505473, 505500, 505701, 505732, 505742, 428930, 427 62, B32B 900, B05D 512
Patent
active
058638695
ABSTRACT:
Superconducting transition metal oxide films are provided which exhibit very high onsets of superconductivity and superconductivity at temperatures in excess of 40.degree. K. These films are produced by vapor deposition processes using pure metal sources for the metals in the superconducting compositions, where the metals include multi-valent nonmagnetic transition metals, rare earth elements and/or rare earth-like elements and alkaline earth elements. The substrate is exposed to oxygen during vapor deposition, and, after formation of the film, there is at least one annealing step in an oxygen ambient and slow cooling over several hours to room temperature. The substrates chosen are not critical as long as they are not adversely reactive with the superconducting oxide film. Transition metals include Cu, Ni, Ti and V, while the rare earth-like elements include Y, Sc and La. The alkaline earth elements include Ca, Ba and Sr.
REFERENCES:
C.W. Chu et al, Physical Review Letters, vol. 58, pp. 405-407 (26 Jan. 1987).
M.K. Wu et al, Physical Review Letters, vol. 58, pp. 908-910 (2 Mar. 1987).
R.H. Koch et al, Material Research Society, Spring Meeting 1987, Pittsburgh, Pa, pp. 81-84.
Chaudhari Praveen
Gambino Richard Joseph
Koch Roger Hilson
Lacey James Andrew
Laibowitz Robert Benjamin
International Business Machines - Corporation
King Roy V.
Morris Daniel P.
Stanland Jackson E.
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