Melting of a physisorbed commensurate phase

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The general Landau-Ginzburg-Wilson Hamiltonian for the melting of a physisorbed 3×3 commensurate phase on a substrate of triangular lattice symmetry is examined. Two limits in which it simplifies are considered: first, the lattice-gas limit resulting from infinite substrate potential, and second, a decoupling limit in which the Hamiltonian reduces to three independent chiral clock models. Universality classes of melting transition with various degrees of symmetry might occur; evidence exists for two. It is argued that the "chiral" transition which may have been observed for Kr on graphite cannot be modeled by a simple lattice gas. Possible phase diagrams are examined and a new spin model with the appropriate symmetry is proposed. The general approach should be applicable to other commensurate surface phases.

Original languageEnglish (US)
Pages (from-to)5031-5038
Number of pages8
JournalPhysical Review B
Issue number9
StatePublished - 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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