Specific Heat of the Driven Curie–Weiss Model

IF 1.3 3区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL
Elena Rufeil Fiori, Christian Maes, Robbe Vidts
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引用次数: 0

Abstract

Applying a time-periodic magnetic field to the standard ferromagnetic Curie–Weiss model brings the spin system in a steady out-of-equilibrium condition. We recall how the hysteresis gets influenced by the amplitude and the frequency of that field, and how an amplitude- and frequency-dependent (dynamical) critical temperature can be discerned. The dissipated power measures the area of the hysteresis loop and changes with temperature. The excess heat determines a nonequilibrium specific heat giving the quasistatic thermal response. We compute that specific heat, which appears to diverge at the critical temperature, quite different from the equilibrium case.

驱动居里-魏斯模型的比热
在标准铁磁居里-韦斯模型中应用时周期磁场,会使自旋系统处于稳定的非平衡状态。我们回顾了磁滞如何受到磁场振幅和频率的影响,以及如何辨别与振幅和频率相关的(动态)临界温度。耗散功率测量磁滞环的面积,并随温度变化。多余的热量决定了非平衡比热,从而给出准静态热响应。我们计算出的比热似乎在临界温度处出现分叉,这与平衡情况截然不同。
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来源期刊
Journal of Statistical Physics
Journal of Statistical Physics 物理-物理:数学物理
CiteScore
3.10
自引率
12.50%
发文量
152
审稿时长
3-6 weeks
期刊介绍: The Journal of Statistical Physics publishes original and invited review papers in all areas of statistical physics as well as in related fields concerned with collective phenomena in physical systems.
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