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

摘要

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 (κ~(-1)) and contact value of the potential (ε) 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-bar10] direction is negative and decreases with increasing the Debye screening length.