Abstract
Based on a generalized lattice gas theory and a Brownian dynamics simulation, we show that the fluctuations of the mean square displacements of a crystalline substrate coupled to the fluctuations of the adsorbate coverage may induce critical behavior for both subsystems. It is shown that an increase of the Lindemann parameter L0 for the substrate drives the adsorbate to condensate. An increase of the coverage fluctuations induces a local melting of the substrate lattice, as this follows from an increase of the coverage-dependent Lindemann parameter L.
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