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摘要翻译：
我们用最大的类固体胚作为序参量，通过自由能景观研究了过冷金纳米团簇的亚稳态液相。在冰点以下，自由能在较小的胚胎尺寸处出现一个局部最小值，在较大的胚胎尺寸处出现一个最大值，这表示临界胚胎尺寸。在t=660K时，随着液相变得不稳定，自由能成为序参量的单调递减函数，表明我们达到了一个调幅。与通常的平均场理论的预测相反，临界胚胎的大小仍然是有限的，随着调幅的接近。我们还计算了成核速率，独立于我们的自由能计算，并观察到当自由能势垒在$kT$量级时，它的温度依赖性迅速增加。这支持了这样一个观点，即在调幅温度附近，冷冻成为一个无障碍的过程。
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英文标题：
《A Limit of Stability in Supercooled Liquid Clusters》
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作者：
Eduardo Mendez-Villuendas Ivan Saika-Voivod Richard K. Bowles
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Soft Condensed Matter 软凝聚态物质
分类描述：Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜，聚合物，液晶，玻璃，胶体，颗粒物质
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We examine the metastable liquid phase of a supercooled gold nanocluster by studying the free energy landscape using the largest solid-like embryo as an order parameter. Just below freezing, the free energy exhibits a local minimum at small embryo sizes and a maximum at larger embryo sizes which denotes the critical embryo size. At T=660K the free energy becomes a monotonically decreasing function of the order parameter as the liquid phase becomes unstable, indicating we have reached a spinodal. In contrast to the usual mean-field theory predictions, the size of the critical embryo remains finite as the spinodal is approached. We also calculate the rate of nucleation, independently from our free energy calculations, and observe a rapid increase in its temperature dependence when the free energy barrier is in the order of $kT$. This supports the idea that freezing becomes a barrierless process around the spinodal temperature.
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PDF链接：
https://arxiv.org/pdf/705.2051
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