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Article overview
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Density affects the nature of the hexatic-liquid transition in two-dimensional melting of core-softened systems | | Mengjie Zu
; Jun Liu
; Hua Tong
; Ning Xu
; | | Date: |
3 May 2016 | | Abstract: | We find that both continuous and discontinuous hexatic-liquid transition can
happen in the melting of two-dimensional solids of core-softened disks. For
three typical model systems, Hertzian, Harmonic, and Gaussian-core models, we
observe the same scenarios. These systems exhibit reentrant crystallization
(melting) with a maximum melting temperature $T_m$ happening at a crossover
density $
ho_m$. The hexatic-liquid transition at a density smaller than
$
ho_m$ is discontinuous. Liquid and hexatic phases coexist in a density
interval, which becomes narrower with increasing temperature and tends to
vanish approximately at $T_m$. Above $
ho_m$, the transition is continuous, in
agreement with the KTHNY theory. For these core-softened systems, the nature of
the hexatic-liquid transition depends on density (pressure), with the melting
at $
ho_m$ being a plausible transition point from discontinuous to continuous
hexatic-liquid transition. | | Source: | arXiv, 1605.0747 | | Services: | Forum | Review | PDF | Favorites | |
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