Surface anharmonicity. Temperature dependence of phonon energies on Cu(110)

A. P. Baddorf, E. W. Plummer

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Abstract

The temperature dependence of surface phonons on Cu(110) has been determined with high resolution electron energy loss Spectroscopy between 21 and 766 K. Phonons at \ ̄gG and at Ȳ, both with atomic motion perpendicular to the surface, have been examined to assess the importance of anharmonicity at the surface. As the temperature is increased the observed phonon energies decrease and the Iinewidths increase. The same percentage decrease is observed at \ ̄gG and Ȳ. A simple model using an anharmonic potential can reproduce the magnitude and shape of the temperature dependence of the phonon at \ ̄gG. Direct comparison with bulk phonon studies shows that the anharmonicity at the surface is 4.1-4.8 times greater.

Original languageEnglish
Pages (from-to)541-550
Number of pages10
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume54-55
Issue numberC
DOIs
StatePublished - 1990

Funding

We are grateful for constructive discussions with David Zehner, Mark Mostoller, and John Wendelken. This work has been supported by the National Science Foundation through grant No. DMR-89-03306 and by the Department of Energy under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

FundersFunder number
National Science FoundationDMR-89-03306
U.S. Department of EnergyDE-AC05-840R21400

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