Superconducting YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ thin films on alkaline earth fluorides

Journal Article · Mon May 15 04:00:00 EDT 1989 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.101507· OSTI ID:6293804

Chan, S; Chase, E W; Wilkens, B J; Hart, D L

Alkaline earth fluorides have low dielectric constants and large band gaps. In addition, they are chemically compatible with and several can be grown epitaxially on silicon and compound semiconductors. We have deposited YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ thin films (200--500 nm thick) directly on (001) SrF/sub 2/, (001) BaF/sub 2/, (001) MgF/sub 2/, and unoriented CaF/sub 2/ single crystals by laser deposition. The substrate temperature was about 720 /sup 0/C and the vacuum chamber was at 350 mTorr of oxygen. For this work, no additional annealing outside the deposition chamber was done after deposition. The deposited YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ films were superconducting and exhibited transition temperatures T/sub c/ (R = 0) of 83, 73, and 74 K on MgF/sub 2/, SrF/sub 2/, and BaF/sub 2/, respectively. Structural studies by x-ray diffraction showed that YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ films on MgF/sub 2/, SrF/sub 2/, and BaF/sub 2/ were polycrystalline and exhibited some (00L) textures. Deposition on CaF/sub 2/ substrates resulted in yellowish, insulating films with Ca- and Ba-rich interfacial reaction products.

• Research Organization: Bellcore, Red Bank, New Jersey 07701
• OSTI ID: 6293804
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:20; ISSN APPLA
• 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
BARIUM COMPOUNDS
BARIUM FLUORIDES
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CHALCOGENIDES
COATINGS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
DATA
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FABRICATION
FILMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
INFORMATION
LASER RADIATION
LOW PRESSURE
LOW TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM FLUORIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
POLYCRYSTALS
RADIATIONS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM FLUORIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE COATING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACUUM COATING
VAPOR DEPOSITED COATINGS
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES