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Phase transition versus disorder: A criterion derived from a two-dimensional dynamic ferromagnetic model

机译:相变与无序:从二维动态铁磁模型得出的准则

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摘要

The dynamical equations for spin correlation functions for the two-dimensional Ising model are discussed for rapid-quench conditions. The temperature of the bath in which the Ising spins are immersed is postulated to be driven by the hyperbolic cooling program T-1 = T0-1 + bt (T0 being the initial temperature, t the time, and b a constant). It is shown that for sufficiently large b the term in the dynamical equations that would normally drive the system into an ordered state would not have time to become effective so that the system freezes into a disordered state. The correlation length for the disordered state is characterized by the distance a random walker on a two-dimensional lattice would have been able to diffuse in the time required for the quench to reduce the temperature to some preassigned value.
机译:讨论了快速淬火条件下二维Ising模型自旋相关函数的动力学方程。假定将浸入Ising自旋的浴的温度由双曲线冷却程序T -1 = T0 -1 + bt(T0为初始值)驱动温度,t时间和ba常数)。结果表明,对于足够大的b,动力学方程中通常会使系统进入有序状态的项将没有时间生效,因此系统冻结为无序状态。无序状态的相关长度的特征在于,二维晶格上的随机助步器能够在淬灭以将温度降低至某个预定值所需的时间内扩散的距离。

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