Surface-phonon dispersion in ultrathin epitaxial films of Ni on Cu(001)
- 15 July 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (2), 1305-1307
- https://doi.org/10.1103/physrevb.40.1305
Abstract
New measurements by high-resolution electron-energy-loss spectroscopy confirm the presence of localized film modes for ultrathin epitaxial films of nickel on a copper (001) substrate. These film modes, predicted recently in lattice-dynamical calculations by Chen, Wu, Yao, and Tong [Phys. Rev. B 39, 5617 (1989)] lie above the Cu-substrate bands and correspond to vibrational motion localized in the Ni overlayer. The Rayleigh-mode dispersion for the epitaxial overlayers is also reported.Keywords
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