Dependence of crystalline orientation on film thickness in laser-ablated YBa sub 2 Cu sub 3 O sub 7 minus. delta. on LaAlO sub 3

Journal Article · Sun Feb 24 23:00:00 EST 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104491· OSTI ID:5638331

Carim, A H ^[1]; Basu, S N; Muenchausen, R E ^[2]

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1. Center for Micro-Engineered Ceramics and Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131 (US)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)

The microstructure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}}{sub {delta}} thin films deposited on (001)LaAlO{sub 3} substrates by a laser ablation process has been investigated by scanning electron microscopy, x-ray diffraction, and cross-sectional transmission electron microscopy. Adjacent to the substrate, the film is entirely oriented with the {ital c}-axis perpendicular to the surface. At a thickness of about 0.4 {mu}m, the occurrence of 90{degree} boundaries brings about a transition to grains with their {ital c}-axes parallel to the surface (aligned along the (100) and (010) directions of the pseudocubic LaAlO{sub 3} substrate). This transition is discussed in terms of the crystal growth anisotropy and the retained strain that may precipitate the transition.

• OSTI ID: 5638331
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 58:8; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ABLATION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIMENSIONS
FILMS
GRAIN ORIENTATION
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SUPERCONDUCTING FILMS
THICKNESS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES