Two-dimensional structural modulation in epitaxial CaF[sub 2] overlayers on Si(111)

Journal Article · Mon Apr 11 04:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.2430· OSTI ID:5112667

Huang, K G; Zegenhagen, J; Phillips, J M; Patel, J R ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States) Max-Planck-Institut, D-7000 Stuttgart 80 (Germany) AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)

Using high-resolution x-ray diffraction a CaF[sub 2] thin film epitaxially grown on a Si(111) substrate is found to exhibit an incommensurately modulated structure parallel to the heterointerface. The overlayer consists of a triangular network of discommensurations, separating regions with two different site occupations of the interfacial Ca, [ital H]3 and [ital T]4. The two-dimensional spatial modulation of the overlayer is induced by the competition between the strong atomic bonding to the substrate and the bonding in the film. Remarkably, the in-plane periodic lattice distortion generated at the interface propagates many atomic layers through the CaF[sub 2] film.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38; AC02-76CH00016
• OSTI ID: 5112667
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:15; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
EPITAXY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HETEROJUNCTIONS
JUNCTIONS
MICROSTRUCTURE
MORPHOLOGY
SCATTERING
SEMICONDUCTOR JUNCTIONS
X-RAY DIFFRACTION