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  • Title: Hexatic phase in the two-dimensional Gaussian-core model.
    Author: Prestipino S, Saija F, Giaquinta PV.
    Journal: Phys Rev Lett; 2011 Jun 10; 106(23):235701. PubMed ID: 21770520.
    Abstract:
    We present a Monte Carlo simulation study of the phase behavior of two-dimensional classical particles repelling each other through an isotropic Gaussian potential. As in the analogous three-dimensional case, a reentrant-melting transition occurs upon compression for not too high temperatures, along with a spectrum of waterlike anomalies in the fluid phase. However, in two dimensions melting is a continuous two-stage transition, with an intermediate hexatic phase which becomes increasingly more definite as pressure grows. All available evidence supports the Kosterlitz-Thouless-Halperin-Nelson-Young scenario for this melting transition. We expect that such a phenomenology can be checked in confined monolayers of charge-stabilized colloids with a softened core.
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