Abstract
Employing the restricted-solid-on-solid model, we show that adsorption may result in a decrease of the roughening temperature ${T}_{R}$ due to (i) indirect next-nearest-neighbor adsorbate-substrate repulsion, (ii) attractive nearest-neighbor adsorbate-substrate lateral interaction, or (iii) repulsive adsorbate-adsorbate lateral interaction. In all these cases, the ratio of ${T}_{R}$ near saturation and for a clean surface is given by a simple combination of the corresponding interactions. The coverage dependence of ${T}_{R},$ obtained for case (i) by Monte Carlo simulations, deviates from the mean-field-type prediction. Adsorbate-induced surface roughening observed in catalytic reactions is also briefly discussed.
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