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Inverse melting in lattice-gas models | | S. Prestipino
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16 Jan 2007 | | Journal: | Phys. Rev. E 75 (2007) 011107 | | Subject: | Statistical Mechanics; Materials Science | | Abstract: | Inverse melting is the phenomenon, observed in both Helium isotopes, by which a crystal melts when cooled at constant pressure. I investigate discrete-space analogs of inverse melting by means of two instances of a triangular-lattice-gas system endowed with a soft-core repulsion and a short-ranged attraction. To reconstruct the phase diagram, I use both transfer-matrix and Monte Carlo methods, as well as low-temperature series expansions. In one case, a phase behavior reminiscent of Helium emerges, with a loose-packed phase (which is solid-like for low temperatures and liquid-like for high temperatures) extending down to zero temperature for low pressures and the possibility of melting the close-packed solid by isobaric cooling. At variance with previous model studies of inverse melting, the driving mechanism of the present phenomenon is mainly geometrical, related to the larger free-energy cost of a ``vacancy’’ in the loose-packed solid than in the close-packed one. | | Source: | arXiv, cond-mat/0701369 | | Other source: | [GID 457426] pmid17358110 | | Services: | Forum | Review | PDF | Favorites | |
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