Abstract
Dynamic coexistence of several phaselike forms, a solid, microcrystalline phase, a homogeneously melted phase, and phases exhibiting a solid core and a melted surface, is found in isothermal molecular-dynamics simulations of magic-number rare-gas clusters. We present a theoretical model for the equilibrium and dynamics of phases of small systems that incorporates homogeneous and heterogeneous phases and gives necessary conditions for the material parameters if a cluster is to exhibit the observed multiple-phase behavior.
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