Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Process of making wire – tape – cable – coil – or fiber
Patent
1990-05-31
1994-10-25
Kunemund, Robert
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Process of making wire, tape, cable, coil, or fiber
505701, 505702, 505729, 505732, C30B 2522
Patent
active
053589270
ABSTRACT:
A method, and the resulting structure, of growing a superconducting perovskite thin film of, for example YBa.sub.2 Cu.sub.3 O.sub.7-x. A buffer layer of, for example, the perovskite PrBa.sub.2 Cu.sub.3 O.sub.7-y, is grown on a crystalline (001) substrate under conditions which favor growth of a,b-axis oriented material. Then the YBa.sub.2 Cu.sub.3 O.sub.7-x layer is deposited on the buffer layer under changed growth conditions that favor growth of c-axis oriented material on the substrate, for example, the substrate temperature is raised by 110.degree. C. However, the buffer layer acts as a template that forces the growth of a,b-axis YBa.sub.2 Cu.sub.3 O.sub.7-x, which nonetheless shows a superconducting transition temperature near that of c-axis oriented films.
REFERENCES:
patent: 4943559 (1990-07-01), Severin et al.
patent: 4962086 (1990-10-01), Gallagher et al.
G. Linker et al, "Control of Growth Direction of Epitaxial YBaCuO Thin Films on SrTiO.sub.3 -Substrates," Solid State Communications, 1989, vol. 69, No. 3 pp. 249-253, month unknown.
A. F. Wells, Structural Inorganic Chemistry, 1975, 4th ed., Clarendon Press, pp. 149-154, month unknown.
H. Asano et al, "Epitaxy and Orientation of Eu.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-y Films Grown In Situ by Magnetron Sputtering," Japanese Journal of Applied Physics, 1989, vol. 28, pp. L981-L983.
Poppe et al, "Epitaxial Multilayers of YBa.sub.2 Cu.sub.3 O.sub.7 and PrBa.sub.2 Cu.sub.3 O.sub.7 as a Possible Basis For Superconducting . . . ", Solid State Comm., vol. 71, No. 7, pp. 569-572 1989.
Inam Arun
Ramesh Ramamoorthy
Rogers, Jr. Charles T.
Bell Communications Research Inc.
Falk James W.
Kunemund Robert
Suchyta Leonard Charles
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