论文标题
金属液体相干长度的居里 - 韦斯温度依赖性的平均场模型
Mean-field model for the Curie-Weiss temperature dependence of coherence length in metallic liquids
论文作者
论文摘要
已知在金属液体中中等范围阶（MRO）的相干长度显示出库里 - 韦斯温度依赖性；它的逆向与温度线性相关，当从玻璃过渡上方的温度推断时，相干长度在负温度下与统一的关键指数在负温度下相差。我们提出了一种均值的伪造模型，该模型解释了这种行为。具体而言，我们将原子及其本地环境建模为具有抗磁交换相互作用的旋转。我们进一步将动态异质性或正在进行合作运动的原子簇之间的交换相互作用叠加。因此，金属液体中的相干长度是动态异质性之间的相关长度。我们的结果重申了一个想法，即MRO连贯性长度是点对点相关性的量度，并且在金属液体中，原子间相互作用的局部挫败感是显着的。
The coherence length of the medium-range order (MRO) in metallic liquids is known to display a Curie-Weiss temperature dependence; its inverse is linearly related to temperature, and when extrapolated from temperatures above the glass transition, the coherence length diverges at a negative temperature with a critical exponent of unity. We propose a mean-field pseudospin model that explains this behavior. Specifically, we model the atoms and their local environment as Ising spins with antiferromagnetic exchange interactions. We further superimpose an exchange interaction between dynamical heterogeneities, or clusters of atoms undergoing cooperative motion. The coherence length in the metallic liquid is thus the correlation length between dynamical heterogeneities. Our results reaffirm the idea that the MRO coherence length is a measure of point-to-set correlations, and that local frustrations in the interatomic interactions are prominent in metallic liquids.
