Epitaxial relations between in situ superconducting YBa sub 2 Cu sub 3 O sub 7 minus x thin films and BaTiO sub 3 /MgAl sub 2 O sub 4 /Si substrates

Journal Article · Wed Aug 15 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346607· OSTI ID:6534585

Hwang, D M; Ramesh, R; Chen, C Y; Wu, X D; Inam, A; Hegde, M S; Wilkens, B; Chang, C C; Nazar, L; Venkatesan, T ^[1]; Miura, S; Matsubara, S; Miyasaka, Y; Shohata, N ^[2]

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1. Bellcore, Red Bank, New Jersey 07701-7040 (USA)
2. NEC Corporation, 4-1-1 Miyazaki, Kawasaki, Kanagawa 213 (Japan)

{ital In} {ital situ} superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} films with {ital T}{sub {ital c}0} up to 87 K and {ital J}{sub {ital c}, 77 K} up to 6{times}10{sup 4} A/cm{sup 2} were prepared on Si substrates with MgAl{sub 2}O{sub 4} and BaTiO{sub 3} double-buffer layers. The epitaxial relations between various layers were established by transmission electron microscopy. The MgAl{sub 2}O{sub 4} layer is heavily faulted. The subsequent BaTiO{sub 3} layer stops most of the faults, provides a template for the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} growth, and partially screens off the stress due to different thermal expansion coefficients. The microstructure of the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} layer is very similar to that of the films deposited directly on SrTiO{sub 3}, exhibiting a homogeneous heavily faulted single-crystal-like structure free from secondary phases and grain boundaries. The slight degradation of the transport properties is attributed to residual thermal stress.

• OSTI ID: 6534585
• Journal Information: Journal of Applied Physics; (USA), Vol. 68:4; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRITICAL CURRENT
EPITAXY
TRANSITION TEMPERATURE
COPPER OXIDES
YTTRIUM OXIDES
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BUFFERS
HIGH-TC SUPERCONDUCTORS
LAYERS
MAGNESIUM OXIDES
SILICON
SUBSTRATES
SUPERCONDUCTING FILMS
TITANATES
TRANSMISSION ELECTRON MICROSCOPY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ELEMENTS
FILMS
MAGNESIUM COMPOUNDS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMIMETALS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties