Surface phonon dispersion curves of thin Pb films on Cu(111)

Braun, J.; Ruggerone, P.; Zhang, G.; Tonnies, J. P.; Benedek, G.

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Surface phonon dispersion curves of thin Pb films on Cu(111)

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Tonnies, J. P.
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Benedek, G.
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Braun, J., Ruggerone, P., Zhang, G., Tonnies, J. P., & Benedek, G. (2009). Surface phonon dispersion curves of thin Pb films on Cu(111). Physical Review B, 79(20), 205423-205435. Retrieved from <Go to ISI>://000266501500104.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-12FD-5

Abstract

Thin films of lead have been grown on the Cu(111) surface and their structure and phonon dispersion curves have been investigated with high-resolution helium atom scattering. The diffraction pattern of the first monolayer (ML) indicates a p(4x4) structure. Films consisting of N=3, 4, 5, and bulklike 50 ML all have a regular (1x1) structure with the same lattice constant as the bulk and small superimposed p(4x4) peaks for the thinnest films. The time-of-flight spectra reveal an unusually large number of inelastic peaks for all the films. The results have been analyzed in terms of dispersion curves which exhibit more than 1/2 the total number of expected two N modes active in the planar scattering geometry. Dispersion curves for an unannealed 5 ML film are also reported. A force-constant model fitted to the bulk dispersion curves can only qualitatively reproduce some of the data but help to explain some features. Along the Gamma over bar-K over bar direction, a Kohn anomaly is identified for the 3, 4, and 5 ML films at nearly the same wave vector as in the bulk along the equivalent direction.