Vibrational properties of epitaxial films on metals. II. fcc Ni on the Cu(001) surface
- 15 March 1989
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 39 (9), 5617-5622
- https://doi.org/10.1103/physrevb.39.5617
Abstract
The general vibrational properties of epitaxially grown fcc Ni film on the Cu(001) surface have been studied using a central-force lattice-dynamical slab model. We found that, since the force constant in the overlayer film is different from that of the substrate, the surface-phonon modes may merge into the substrate bulk-phonon band, and a strong hybridization between the surface phonons and the bulk modes may take place. The theoretical phonon dispersion curves and the spectral densities are presented, and new film modes have been identified.Keywords
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