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Abstract
The dispersion of surface phonons for a disordered metal alloy has been measured for the first time. High-resolution electron energy loss spectroscopy (HREELS) was used to investigate the surface phonon dispersion of Ni 90Pt 10(001) in the [110] direction. The Rayleigh wave was found to be rather similar to the Rayleigh phonon observed on the clean Ni(001) surface. For this mode a substantial broadening of the line width is observed which seems to arise from the Pt impurities at the surface. No low-frequency resonance mode (Pt impurity vibration) could be detected.
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