Elastic properties and Poisson's ratio of the face centered cubic (fcc) phases of three systems of particles which interact, respectively, through: 1) hard sphere potential (HSP), 2) repulsive Yukawa potential (RYP), and 3) hard‐core repulsive Yukawa potential (HCRYP), studied by Monte Carlo (MC) simulations in the NpT ensemble, are compared in a broad range of pressures between melting and close packing. Partial auxeticity is observed in each of the considered systems and the role of the RYP and HSP, incorporated in HCRYP, is revealed. This study confirms intuitive expectations that the elastic properties of the system with particles interacting through HCRYP at high pressures are well approximated by hard spheres, whereas in the low pressures regime they are close to those obtained for the system with pure Yukawa interactions. It is also demonstrated that in the “transition region”, when the HCRYP system is neither close to RYP nor to HSP system, its Poisson's ratio in the directions [110][ $1\overline{1}0$] exceeds the ranges given by RYP and HSP for those directions.

中文翻译：

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软汤川势和硬核相互作用对硬核排斥汤川颗粒的面心立方晶体的消融性的影响

三种分别通过以下方式相互作用的粒子系统的面心立方（fcc）相的弹性性质和泊松比：1）硬球势（HSP），2）排斥汤河势（RYP）和3）硬核排斥汤川电位（HCRYP），通过蒙特卡罗（MC）研究了在模拟NPT在熔化和密堆积之间的广泛压力范围内对整体进行比较。在每个所考虑的系统中均观察到部分膨胀性，并揭示了将RYP和HSP（并入HCRYP）的作用。这项研究证实了直觉上的期望，即在高压下具有通过HCRYP相互作用的颗粒的系统的弹性特性可以通过硬球很好地近似，而在低压状态下，它们接近于具有纯Yukawa相互作用的系统所获得的弹性。还表明，在“过渡区”，当HCRYP系统既不接近RYP也不接近HSP系统时，其泊松比在[110]方向上[$\mathrm{1个}\overline{\mathrm{1个}}0$]超出了RYP和HSP针对这些方向给出的范围。