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Epitaxial films of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ on NdGaO/sub 3/, LaGaO/sub 3/, and SrTiO/sub 3/ substrates deposited by laser ablation

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.101559· OSTI ID:6228971
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Frequency-doubled Nd:YAG laser (532 nm) pulses of 1.7 J/cm/sup 2/ and 10 ns duration were used to deposit thin films of YBa/sub 2/ Cu/sub 3/ O/sub 7-//sub delta/ by laser ablation on NdGaO/sub 3/ , LaGaO/sub 3/, and SrTiO/sub 3/ substrates held at 725 +- 5 /sup 0/C in 0.2 Torr of O/sub 2/ ambient. Electrical resistivities versus temperature of all films show normal metallic behavior and sharp superconducting transitions with T/sub c/ (R = 0) at 92--93 K. Critical current densities in 0.3--0.6 ..mu..m thick, 200 ..mu..m long, and 10--30 ..mu..m wide strips were measured to be 10/sup 6/ A/cm/sup 2/ at 60, 77, and 80 K in the films on LaGaO/sub 3/, NdGaO/sub 3/, and SrTiO/sub 3/, respectively. X-ray diffraction patterns show that all films grew epitaxially, with domains of only two crystalline orientations rotated 90/sup 0/ with respect to each other in the a-b plane (consistent with twins), and the c axis perpendicular to the substrates. The closely matched lattice constants of the film and substrates (0.8--2.1%) result in epitaxial growth of the films.

Research Organization:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
OSTI ID:
6228971
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:11; ISSN APPLA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABLATION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DATA
DIFFRACTION
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EPITAXY
EXPERIMENTAL DATA
FABRICATION
FILMS
GALLIUM COMPOUNDS
GALLIUM OXIDES
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LASER RADIATION
LASERS
LATTICE PARAMETERS
LOW TEMPERATURE
NEODYMIUM LASERS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
SCATTERING
SOLID STATE LASERS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
THICKNESS
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VAPOR PHASE EPITAXY
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES