Process for the increase in critical temperature of high T.sub.c

Details Process for the increase in critical temperature of high T.sub.c Process for the increase in critical temperature of high T.sub.c

1992-07-22

1994-05-03

King, Roy V.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With measuring or testing of superconducting properties

505730, 505731, 505780, 505781, 505476, 505300, 427 62, B05D 512

Patent

active

053088018

ABSTRACT:
A method is disclosed to increase the critical transition temperature of superconducting materials by the selective application of stress to specific crystal directions. It has been found that by applying tensile stresses in certain directions and compressive stresses in other directions that the critical temperature of superconducting materials can be substantially increased.

REFERENCES:
Crommie et al, "C-Axis Stress Dependence of Normal and Superconducting State Properties of YBa.sub.2 Cu.sub.3 O.sub.7 ", Physical Review B, 39(7) Mar. 1989 pp. 4231-4234.
Bud'ko et al, "Uniaxial Pressure Dependence of the Superconducting Critical Temperature in RBa.sub.2 Cu.sub.3 O.sub.7-.delta. High-T.sub.c Oxides", Physical Review B, 46(2) Jul. 1992 pp. 1257-1260.
Okai et al, "Effect of Pressure on Superconducting Transition Temperature of Y.sub.0.4 Ba.sub.0.6 CuO.sub.y " Jpn. J. Appl. Phys. 261(5), May 1987, L820-821.
Meingast et al, Physical Review Letters, "Large a-b Anistrophy of the Expansivity Anomaly at T.sub.c in Untwinned YBa.sub.2 Cu.sub.3 O.sub.7-.delta. ", vol. 67, No. 12, Sep. 1991, pp. 1634-1637.
Cava et al., Physical Review B, "Single-phase 60-K Bulk Superconductor In Annealed Ba.sub.2 YCU.sub.3 O.sub.7-.delta. ", vol. 36, No. 10, Oct. 1987, pp. 5719-5722.
Chu et al., Physical Review Letters, "Evidence for Superconductivity Above 40K In The La-Ba-Cu-O Compound System", vol. 58, No. 4, Jan. 1987, pp. 405-407.
Xu et al., Physical Review B, "Microstructure, Lattice Parameters, and Superconductivity of YBa.sub.2 (Cu.sub.1-x Fe.sub.x).sub.3 O.sub.7-.delta. For 0.ltoreq.x.ltoreq.0.33", vol. 39, No. 10, Apr. 1989, pp. 6667-6680.

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