Application of a near coincidence site lattice theory to the orientations of YBa sub 2 Cu sub 3 O sub 7 minus x grains on (001) MgO substrates

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104138· OSTI ID:6411835

Hwang, D M; Ravi, T S; Ramesh, R; Chan, S; Chen, C Y; Nazar, L ^[1]; Wu, X D; Inam, A; Venkatesan, T ^[2]

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1. Bellcore, Red Bank, NJ (USA)
2. Physics Department, Rutgers University, Piscataway, NJ (USA)

Various orientations of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} grains in polycrystalline films prepared on (001)MgO substrates by {ital in} {ital situ} laser deposition were determined using electron diffraction. Eight different types of in-plane orientations have been observed. These orientations agree well with the prediction of a simplified theory of near coincidence site lattice between YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} and MgO. The YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} grains were found to have a high probability of forming low angle or low {Sigma} boundaries among themselves. These grain boundaries are of low energy and should exhibit a high connectivity of Cu-O-Cu chains. Therefore, YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} thin films on MgO can attain a {Tc} of {approximately}90 K and a {ital J}{sub {ital c}} of {approximately}10{sup 6} A/cm{sup 2} at 77 K.

• OSTI ID: 6411835
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:16; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
FILMS
GRAIN BOUNDARIES
GRAIN ORIENTATION
HIGH-TC SUPERCONDUCTORS
INFORMATION
MICROSTRUCTURE
NUMERICAL DATA
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SCATTERING
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES