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Universal behavior of soft-core fluids near the threshold of thermodynamic stability

机译：热核液附近热力学稳定性阈值的普遍行为

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We study, by using liquid-state theories and Monte Carlo simulation, the behavior of systems of classical particles interacting through a finite pair repulsion supplemented with a longer range attraction. Any such potential can be driven Ruelle-unstable by increasing the attraction at the expense of repulsion, until the thermodynamic limit is lost. By examining several potential forms, we find that all systems exhibit a qualitatively similar behavior in the fluid phase as the threshold of thermodynamic stability is approached (and possibly surpassed). The general feature underlying the approach to Ruelle instability is a pronounced widening of the liquid-vapor binodal (and spinodal) line at low temperatures, to such an extent that at the stability threshold a vanishing-density vapor would coexist with a diverging-density liquid. We attempt to rationalize the universal pathway to Ruelle instability in soft-core fluids by appealing to a heuristic argument. Published by AIP Publishing.
机译：通过使用液态理论和蒙特卡罗模拟，通过补充较长范围吸引的有限对排斥来进行液态理论和蒙特卡罗模拟的古典颗粒系统的行为。 通过增加牺牲排斥力的吸引力，任何这样的潜力都可以被驱动Ruelle-unstable，直到热力学限制丢失。 通过检查几种潜在形式，发现所有系统在流体阶段中表现出质量相似的行为，因为接近热力学稳定性的阈值（并且可能超过）。 潜在的方法的一般特征是在低温下的液体蒸汽二烯（和旋转晶岩）线的液体 - 蒸汽二烯峰（和旋顶）管线的扩大，在稳定性阈值下消失密度蒸气将与发散密度液体共存的程度 。 我们试图通过吸引启发式论点来利用软核心流体中的普遍途径。 通过AIP发布发布。

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