We have explored the structure and the dynamics of a bimetallic system consisting of a hexagonal (almost) overlayer of Ag on a square lattice (Ni(100) and Cu(100)), as a function of the surface temperature. In each case the structure is “nearly” incommensurate giving rise to a low frequency Goldstone mode. Also, the overlayer atoms slosh back and forth over the substrate in a corrugated fashion. The calculated dispersion of the Ag/metal vertical mode, at room temperature, is in excellent agreement with experimental data. At higher temperatures floater atoms appear on top of the overlayer displaying a variety of cluster formations and also exchanges with the substrate atoms leading to surface disordering, interdiffusion and melting.
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Rahman, T.S., Black, J.E. & Tian, Z.J. Dynamics of a Metal Overlayer on Metallic Substrates–High Temperature Effects. MRS Online Proceedings Library 291, 205–210 (1992). https://doi.org/10.1557/PROC-291-205