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Composition-tuned smeared phase transitions

机译:成分调整的拖尾相变

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Phase transitions in random systems are smeared if individual spatial regions can order independently of the bulk system. In this paper, we study such smeared phase transitions (both classical and quantum) in substitutional alloys A_(1-x)B_x that can be tuned from an ordered phase at composition x = 0 to a disordered phase at x = 1. We show that the ordered phase develops a pronounced tail that extends over all compositions x < 1. Using optimal fluctuation theory, we derive the composition dependence of the order parameter and other quantities in the tail of the smeared phase transition. We also compare our results to computer simulations of a toy model, and we discuss experiments.
机译:如果各个空间区域可以独立于整体系统进行排序,则将涂抹随机系统中的相变。在本文中,我们研究了替代合金A_(1-x)B_x中的这种弥散相变(古典和量子),可以将其从组成x = 0的有序相调整为x = 1的无序相。认为有序相会形成一条明显的尾部,该尾部延伸到所有成分x <1上。使用最佳波动理论,我们得出了拖尾相变尾部中阶数参数和其他数量的成分依赖性。我们还将结果与玩具模型的计算机仿真进行比较,并讨论实验。

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