Oxide superconductor Josephson junction and fabrication method t

Details Oxide superconductor Josephson junction and fabrication method t Oxide superconductor Josephson junction and fabrication method t

1980-10-31

1982-02-23

Silverberg, Sam

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

357 5, 427 63, 29599, H01L 3922

Patent

active

043167853

ABSTRACT:
A tunneling Josephson junction is disclosed in which first and second superposed superconducting electrode layers are formed of thin films of oxide superconducting materials having a perovskite structure of BaPB.sub.1-x Bi.sub.x O.sub.3. A barrier layer interposed between these superconducting electrode layers is a thin film of long service life which is stable and breakdown free under heat cycles from room temperature to ultra low temperatures. This film is made of an oxide with perovskite structure which has the same crystal structure and thermal expansion coefficient as those of the first and second superconducting layers for functioning as an insulator or a semiconductor. The oxide with perovskite structure may be BaSnO.sub.3, Ba.sub.1-y Sr.sub.y Pb.sub.1-x Bi.sub.x O.sub.3 (wherein 0.ltoreq.x.ltoreq.0.3, y>0.3) or BaPb.sub.1-x (A.sub.1-y Bi.sub.y)O.sub.3 (wherein A is at least one member selected from the group consisting of V, Nb, Ta and Sb; 0.1.ltoreq.x.ltoreq.0.3; and 0.ltoreq.y.ltoreq.0.5).

REFERENCES:
patent: 3932315 (1976-01-01), Sleight
patent: 4176365 (1979-11-01), Kroger
Gilbert et al. Thin Solid Films, 54 (1978), 129-136.

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