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Glass transition of two-dimensional 80-20 Kob-Andersen model at constant pressure

Abstract : We reconsider numerically the two-dimensional version of the Kob-Andersen model (KA2d) with a fraction of 80% of large spheres. A constant moderate pressure is imposed while the temperature T is systematically quenched from the liquid limit through the glass transition at T-g approximate to 0.3 down to very low temperatures. Monodisperse Lennard-Jones (mdLJ) bead systems, forming a crystal phase at low temperatures, are used to highlight several features of the KA2d model. As can be seen, e.g. from the elastic shear modulus G(T), determined using the stress-fluctuation formalism, our KA2d model is a good glass-former. A continuous cusp-singularity, G(T) proportional to (1 - T/T-g)(alpha) with alpha approximate to 0.6, is observed in qualitative agreement with other recent numerical and theoretical work, however in striking conflict with the additive jump discontinuity predicted by mode-coupling theory.
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D. Li, H. Xu, J. P. Wittmer. Glass transition of two-dimensional 80-20 Kob-Andersen model at constant pressure. Journal of Physics: Condensed Matter, IOP Publishing, 2016, 28 (4), ⟨10.1088/0953-8984/28/4/045101⟩. ⟨hal-01515447⟩



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