High T/sub C/ superconductors: composite wire fabrication

Journal Article · Mon Jul 20 04:00:00 EDT 1987 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.98923· OSTI ID:6508091

Jin, S; Sherwood, R C; van Dover, R B; Tiefel, T H; Johnson, Jr, D W

Commercially useful, bulk superconductors typically require stabilization using a normal metal cladding for reasons of electrical, thermal, and mechanical protection and, in general, need to be drawn into fine fibers and wound into a magnet configuration. The recent discovery of high-T/sub C/ superconductor materials such as Ba/sub 2/YCu/sub 3/O/sub 7/ stimulated worldwide interest in the subject, however, with much concern about fabricability of such brittle ceramic materials into desirable fine wire geometry. In this letter, we report preliminary success in the fabrication of fine-wire, composite superconductors consisting of a high-conductivity normal metal shell such as Ag or Cu/Ni/Au and a superconducting core of Ba/sub 2/YCu/sub 3/O/sub 7/ oxide. The wire is would into a coil, and then heat treated to produce the desired chemistry in a dense structure. The resistivity of the composite wire is measured to be zero at approx. =90 K (in zero field) with a zero-field critical density of approx. =175 A/cm/sup 2/. Microscopy and x-ray analysis show that the superconducting core is continuous, and retains phase composition after wire drawing and heat treatment. These results demonstrate the feasibility of producing superconducting ceramic composite wire, although the practical applications must await the resolution of many practical problems and reliability issues.

• Research Organization: ATandT Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 6508091
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 51:3; ISSN APPLA
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
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ELECTRIC CONDUCTIVITY
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ELEMENTS
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