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

Journal Article · Mon Nov 13 04:00:00 EST 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102347· OSTI ID:5371684

Kampwirth, R T; Andersen, P H; McDonald, D B; Miller, D J; Gray, K E; Sungaila, Z F; Balachandran, U; Wagner, A ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)

Superconducting films of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} have been fabricated on single-crystal MgO substrates by a low-temperature {ital in situ} process. Using a substrate temperature {ital T}{sub {ital s}}{approx}645 {degree}C, metallic films with a superconducting onset of 90--100 K and an extrapolated {ital T}{sub {ital c}0}=56 K have been obtained. X-ray diffraction shows the films to be {ital c}-axis oriented. Electron microscopy reveals that the films are not significantly smoother than films which were post-annealed at 865 {degree}C, and that some segregation into 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.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5371684
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:20; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COATINGS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FABRICATION
FILMS
HEAT TREATMENTS
HIGH TEMPERATURE
INFORMATION
LOW TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
ROUGHNESS
SCATTERING
SEGREGATION
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VAPOR DEPOSITED COATINGS
VERY HIGH TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION