Surface melting and surface disordering in binary alloy thin films

An interdependence between the surface melting and the surface disordering observed in binary alloy thin films is considered in the context of their mutual relations. The present discussion allows us to extend the diagram of phase transitions to the case when the crystallinity parameter behavior influences the local concentration profiles and the lattice order parameter describing the alloy structure. In particular, the surface-induced disorder is described when the crystal structure is preserved and, in contrast, when the surface melting is expected for partially disordered samples.