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Monte Carlo simulations of an AgcCu1−c monolayer deposited onto Cu(001) show that a complete miscibility of two elements adopting different crystallographic structures can be observed in the surface, while experimental bulk phase diagrams preclude a similar phenomenon in the bulk. While the deposited pure Ag monolayer is pseudo-hexagonal and the pure Cu monolayer is square and pseudomorphic, for intermediate concentrations at sufficiently high temperatures a disordered state appears in which square and hexagonal environments respectively due to Cu and Ag coexist. As a result, the surface phase diagram does not present any miscibility gap at 650 K. PACS numbers: 68.35.Md, 68.55.-a, 68.18.Jk, 68.47.De

Complete miscibility between different crystallographic structures: Monte Carlo simulations of Cu-Ag deposited on Cu(001)