Surface composition of clean, epitaxial thin films of YBa sub 2 Cu sub 3 O sub 7 minus x from quantitative x-ray photoemission spectroscopy analysis

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.2828· OSTI ID:5845078

Frank, G; Ziegler, C; Goepel, W ^[1]

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1. Institute of Physical and Theoretical Chemistry, University of Tuebingen, D-7400 Tuebingen, Federal Republic of Germany (DE)

Angle-dependent x-ray photoemission spectra (XPS) of epitaxial thin-film YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} show characteristic reversible and distinct changes with different surface treatments. These changes are analyzed by applying a new model for the quantitative XPS analysis, which takes into consideration the anisotropic structure of {ital c}-axis-oriented YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}. The analysis makes it possible to differentiate between different elemental compositions of the outer layers in the surface unit cell. Evaluations of our experimental data indicate that only surfaces with a nominal BaO and CuO layer composition exist in the outermost atomic layer.

• OSTI ID: 5845078
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:4; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CHEMICAL COMPOSITION
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTING FILMS
YTTRIUM OXIDES
BINDING ENERGY
EPITAXY
PHOTOELECTRON SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRON SPECTROSCOPY
ENERGY
FILMS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties