Sputtered superconducting films of Bi sub 2 Sr sub 2 CaCu sub 2 O sub x made by low-temperature, in situ growth

Conference · Thu Jan 25 04:00:00 EST 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

DOI:https://doi.org/10.1063/1.39059· OSTI ID:6550649

Kampwirth, R T; Gray, K E; Andersen, P H; McDonald, D B; Miller, D J ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, IL (USA)

Composite target rf magnetron sputtering has previously been successfully employed to make superconducting films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} {ital in}-{ital situ} at substrate temperature T{sub s}{lt}700 {degree}C. We report the successful growth of superconducting films of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} on single crystal MgO substrates by a low-temperature process using dc magnetron sputtering from a Bi-enriched composite target. Using a substrate temperature T{sub s}{approx}645 {degree}C, metallic films with a superconducting onset of 90--100 K and an extrapolated T{sub c0}=56 K have been obtained. X-ray diffraction shows the films to be c-axis oriented. Electron microscopy reveals that the films are not significantly smoother nonsuperconducting phases had occurred. The exact mechanism by which crystallization and superconductivity occurs at such low temperatures is not yet known, but it can be speculated that the surface atoms are less constrained and thus have a smaller energy barrier to overcome in forming a crystal structure.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6550649
• Report Number(s): CONF-891092--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 199:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COATINGS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FILMS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
VAPOR DEPOSITED COATINGS
X-RAY DIFFRACTION