Anomalous melting scenario of the two-dimensional core-softened system.
We present a computer simulation study of the phase behavior of two-dimensional (2D) classical particles repelling each other through an isotropic core-softened potential. As in the analogous three-dimensional (3D) case, a reentrant-melting transition occurs upon compression for not too high pressures, along with a spectrum of waterlike anomalies in the fluid phase. However, in two dimensions in the low density part of the phase diagram melting is a continuous two-stage transition, with an intermediate hexatic phase. All available evidence supports the Kosterlitz-Thouless-Halperin-Nelson-Young scenario for this melting transition. On the other hand, at the high density part of the phase diagram one first-order transition takes place.
Institute for High Pressure Physics RAS, Kaluzhskoe Shosse, 14, Troitsk, 142190 Moscow, Russia.
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Dudalov
Institute for High Pressure Physics RAS, Kaluzhskoe Shosse, 14, Troitsk, 142190 Moscow, Russia and Moscow Institute of Physics and Technology, 141700 Moscow, Russia.
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Fomin
Institute for High Pressure Physics RAS, Kaluzhskoe Shosse, 14, Troitsk, 142190 Moscow, Russia.
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Tsiok
Institute for High Pressure Physics RAS, Kaluzhskoe Shosse, 14, Troitsk, 142190 Moscow, Russia and Moscow Institute of Physics and Technology, 141700 Moscow, Russia.
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Ryzhov