Partially auxetic behavior in fcc crystals of hard-core repulsive Yukawa particles

Elastic properties of the face centered cubic (fcc) phase of particles, interacting through hard-core repulsive Yukawa potential are determined by Monte Carlo (MC) simulations in the NpT ensemble with variable shape of the periodic box. The effects of the Debye screening length (-1) and contact value of the potential (epsilon) on elastic properties of the system are studied. It is found that the hard-core repulsive Yukawa system is partially auxetic. The Poisson's ratio of the system in the [110][1 (1) over bar0] direction is negative and decreases with increasing the Debye screening length. [GRAPHICS] Poisson's ratio of the hard-core repulsive Yukawa system measured in the [110][1 (1) over bar0] directions at beta epsilon = 39 versus density. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim