We redraw, using state-of-the-art methods for free-energy calculations, thephase diagrams of two reference models for the liquid state: the Gaussian andinverse-power-law repulsive potentials. Notwithstanding the different behaviorof the two potentials for vanishing interparticle distances, theirthermodynamic properties are similar in a range of densities and temperatures,being ruled by the competition between the body-centered-cubic (BCC) andface-centered-cubic (FCC) crystalline structures and the fluid phase. Weconfirm the existence of a reentrant BCC phase in the phase diagram of theGaussian-core model, just above the triple point. We also trace the BCC-FCCcoexistence line of the inverse-power-law model as a function of the powerexponent $n$ and relate the common features in the phase diagrams of suchsystems to the softness degree of the interaction.
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机译：我们使用最先进的方法进行自由能计算，重新绘制了两种液体参考模型的相图：高斯和反幂律排斥势。尽管两种消失粒子间距离的势能的行为不同，但它们的热力学性质在一定的密度和温度范围内是相似的，这取决于体心立方（BCC）和面心立方（FCC）晶体结构之间的竞争。流体相。我们确认高斯核模型的相图中存在可重入BCC相，正好在三重点上方。我们还根据功率指数$ n $追踪了逆幂律模型的BCC-FCC共存线，并将此类系统的相图中的共同特征与相互作用的柔和度相关联。
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