Edge melting in low-coverage adsorbed films

D.B. Pengra, J.G. Dash

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A calorimetric study of low-coverage (0.13-0.36 layer) Ne films adsorbed on graphite foam explores the broadening of melting peaks in the vicinity of the two-dimensional triple point. Preliminary analysis confirms earlier indications that premelting is due to edge melting of long strips of film that decorate linear defects and steps on the substrate. A new model that incorporates these substrate effects and a new method of analysis that considers coverage-dependent trends have been developed to fit the data. The fitting indicates that additional substrate effects complicate the analysis; these are discussed, and it is concluded that adsorbate size effects are relatively unimportant, but that heterogeneity in the substrate binding energy may augment the edge melting process.
    Original languageEnglish
    JournalJournal of Physics Condensed Matter
    Volume4
    Issue number36
    Pages (from-to)7317-7332
    ISSN0953-8984
    DOIs
    Publication statusPublished - 1992

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