Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Producing josephson junction – per se
Patent
1994-04-08
1995-07-11
King, Roy V.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Producing josephson junction, per se
505325, 505480, 505702, 505701, 427 62, 427 63, 257 34, H01L 3924
Patent
active
054321492
ABSTRACT:
A weak link is patterned from a high-temperature superconducting film using standard lithographic techniques. Once the area in which the weak link is to be located is defined, the remainder of the film is covered with an oxygen-impermeable material. The oxygen is then removed in the weak link area by placing the sample in a vacuum furnace at a sufficient temperature to drive out the oxygen. Once the oxygen is removed, the weak link becomes non-superconducting. A high power solid state laser is placed in front of the weak link, and superconductivity is restored in the weak link area, in situ. The process is performed in a liquid nitrogen environment.
REFERENCES:
Robbes et al, "Josephson Weak Links in Thin Films of YBa.sub.2 Cu.sub.3 O.sub.7-x Induced by Electrical Pulses", Appl. Phys. Lett. 56(22) May 1990, pp. 2240-2242.
Yoshida et al, "Monolithic Device Fabrication using High-Tc Superconductor", International Electron Devices Meeting (Sanfancisco, Calif.) Dec. 11-14, 1988 pp. 282-285.
Nieva et al., "Photoinduced Enhancement of Superconductivity" Appl. Phys. Lett. 60(17) Apr. 1992 pp. 2159-2161.
"Superconductivity--The State That Came in from the Cold", T. H. Geballe et al., Science, vol. 239, pp. 367-374, Jan. 22, 1988.
"Transient Photoinduced Conductivity in Semiconducting Single Crystals of YBa.sub.2 Cu.sub.3 O.sub.6.3 : Search for Photoinduced Metallic State and for Photoinduced Superconductivity", G. Yu et al., Solid State Communications, vol. 72, No. 4, pp. 345-349, 1989.
"Dependence of Photoinduced Superconductivity on Illumination Dose in YBa.sub.2 Cu.sub.3 O.sub.6.4 Films", V. I. Kudinov et al., Physics Letters A, vol. 157, No. 4.5, pp. 290-294, Jul. 29, 1991.
"Controlled Preparation of Oxygen Deficient YBa.sub.2 Cu.sub.3 O.sub.x Films", E. Osquiguil et al., Appl. Phys. Lett., 60 (13), pp. 1627-1629, Mar. 30, 1992.
Bruynseraede Yvan
Guimpel Julio J.
Nieva Gladys L.
Osquiguil Eduardo
Schuller Ivan K.
King Roy V.
Regents of the University of California
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