Abstract
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 language | English (US) |
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Pages (from-to) | 5031-5038 |
Number of pages | 8 |
Journal | Physical Review B |
Volume | 29 |
Issue number | 9 |
DOIs | |
State | Published - Jan 1 1984 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics