Depth dependence of the anomalous thermal behavior of Cu(110)

S. Thevuthasan, W. N. Unertl

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We report the results of a mirror electron microscope low energy electron diffraction (MEM-LEED) study of anomalous thermal behavior caused by enhanced thermal vibrational motion on a clean Cu(110) surface. The enhanced vibrational amplitudes cause diffracted intensities to deviate from simple Debye-Waller behavior. These deviations become apparent between 550 K and 600 K; i.e. at about 0.45 of the bulk melting temperature. Because of the finite penetration of low energy electrons, LEED intensities contain information about both surface and subsurface order. Our LEED results are analyzed to extract this information using a kinematical model in which the electron attenuation and the depth and temperature dependent vibrational amplitudes are parametrized. For a large range of model parameters, we conclude that by 850 K large anharmonic vibrations are present in several layers and at least two subsurface layers may have melted.

    Original languageEnglish
    Pages (from-to)216-220
    Number of pages5
    JournalApplied Physics A Solids and Surfaces
    Volume51
    Issue number3
    DOIs
    Publication statusPublished - 1 Sep 1990

    Keywords

    • 68.35 Ja
    • 68.35 Rh

    ASJC Scopus subject areas

    • Materials Science(all)
    • Engineering(all)
    • Physics and Astronomy (miscellaneous)

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