Density effects in a bulk binary Lennard-Jones system

Details Density effects in a bulk binary Lennard-Jones system Density effects in a bulk binary Lennard-Jones system

2002-09-11

arxiv.org/abs/cond-mat/0209268v1

Phys. Rev. B 68, 144202 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

10 pages, 7 figures

Scientific paper

10.1103/PhysRevB.68.144202

Properties of local minima as a function of density are studied in a binary Lennard-Jones system for kinetic equipartition temperatures $T=1.0$ (normal liquid), 0.5 (supercooled liquid), and 0.4 (glass), in reduced units. The number of different local minima sampled, energy, pressure, normal mode angular frequencies, mean distance between all pairs of local minima and partial radial distribution functions are presented. In agreement with previous studies by Sastry [Phys. Rev. Lett. {\bf 85}, 590 (2000)] a limiting density is found at $\rho_l=1.06$ with negative pressure, below which the local structure of the glass and the supercooled phases are essentially the same, as evidenced by the partial radial distribution functions. The mean energy, pressure, and normal mode frequencies have values that are practically independent of the temperature below $\rho_l$.

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