Phase characterization of dysprosium barium copper oxide thin films grown on strontium titanate by molecular beam epitaxy

Journal Article · Mon May 01 00:00:00 EDT 1989 · J. Mat. Res.; (United States)

DOI:https://doi.org/10.1557/JMR.1989.0476· OSTI ID:5918236

Hellman, E S; Schlom, D G; Marshall, A F; Streiffer, S K; Beasley, M R; Bravman, J C; Geballe, T H; Eckstein, J N; Webb, C; others, and

X-ray diffraction, transmission electron microscopy, and /ital in/ /ital situ/ reflection high energy electron diffraction studies of thin epitaxial dysprosium barium copper oxide films grown by oxygen plasma molecular beam epitaxy (MBE) on strontium titanate substrates are presented. A remarkable variety of structure is revealed, making clear both the possibilities and challenges for this growth technique as applied to the cuprate superconductors. The films studied are highly epitaxial, obtained through the use of shuttered molecular beams to encourage the layered structure characteristic of superconducting DyBa/sub 2/Cu/sub 3/O/sub 7/minus//ital x// (''123''). While some of these films are superconducting as deposited, more often they are semiconducting or insulating. The 123-like material in these films has a lengthened c-axis, perhaps due to nonstoichiometry. Phases related to DyBa/sub 3/Cu/sub 2/O/sub /ital x// (the other perovskite) are also very important for epitaxial growth, and display a distinctive signature in the RHEED patterns. Other epitaxial impurity phases including BaCuO/sub 2/ and a new orthorhombic phase are also characterized.

• Research Organization: Stanford University, Stanford, California 94305 (US); Varian Research Center, Palo Alto, California 94303
• OSTI ID: 5918236
• Journal Information: J. Mat. Res.; (United States), Vol. 4:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
PHASE STUDIES
COPPER OXIDES
DYSPROSIUM OXIDES
ELECTRON DIFFRACTION
IN-SITU PROCESSING
MOLECULAR BEAM EPITAXY
STRONTIUM TITANATES
SUPERCONDUCTING FILMS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
DYSPROSIUM COMPOUNDS
ELECTRON MICROSCOPY
EPITAXY
FILMS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies