Melting scenarios of two-dimensional Hertzian spheres with a single triangular latticeстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 июня 2020 г.
Аннотация:We present a molecular dynamics simulation study of the phase diagram and melting scenarios of twodimensional Hertzian spheres with exponent 7/2. We have found multiple re-entrant melting of a single crystal with a triangular lattice in a wide range of densities from 0.5 to 10.0. Depending on the position on the phase diagram, the triangular crystal has been shown to melt through both two-stage melting with a first-order hexatic–isotropic liquid transition and a continuous solid–hexatic transition as well as in accordance with the Berezinskii–Kosterlitz–Thouless–Halperin–Nelson–Young (BKTHNY) scenario (two continuous transitions with an intermediate hexatic phase). We studied the behavior of heat capacity and have shown that despite two-stage melting, the heat capacity has one peak which seems to correspond to a solid–hexatic transition.