In-Band Modes of Vibration of A Copper-3 at.% Gold Alloy

The atomic vibrations in a single crystal of Cu-3 at.% Au have been studied using inelastic neutron scattering. The line shapes and widths of the neutron groups, and the shifts from the corresponding frequencies for the host (pure copper), agree substantially with calculations based on the theory of Elliott and Maradudin, but appear to show slight deviations which are in the same direction as, but much less marked than, those exhibited by the results of previous measurements on single crystals of Cu-9.3 at.% Au.