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arXiv 2106.16232cond-mat.stat-mech
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粗化转变对磁有序化的影响

Influence of Roughening Transition on Magnetic Ordering

Nalina Vadakkayil, Sanat K. Singha, Subir K. Das

摘要:

在磁相变的文献中,除了临界点之外,还讨论了另一个特殊点的存在。这与两种不同有序相之间的界面加宽有关,被称为粗化转变点。虽然有很好的理解与此过渡的平衡特性,这对非平衡动力学的影响还没有被调查。在本文中,我们提出了全面的结果,从蒙特卡罗模拟,在一个系统的粗化动力学,在很宽的温度范围内,在空间维度d = 3,其中存在粗化过渡在非零温度。对结构、生长和老化模拟数据的最新分析表明,该系统中意外的玻璃状缓慢动力学的开始(最近受到广泛关注),用于淬火至零温度,实际上发生在这个转变点。这表明了相序动力学中一个重要的结构动力学联系。我们比较的关键结果与那些从d = 2,其中不存在非零的粗糙化转变温度。在后一个维度中没有上述的反常特征,使我们对粗糙化过渡的作用的推测有了更坚实的基础。

英文摘要:

In the literature of magnetic phase transitions, in addition to a critical point, existence of another special point has been discussed. This is related to the broadening of interface between two different ordering phases and is referred to as the point of roughening transition. While there exists good understanding on equilibrium properties associated with this transition, influence of this on nonequilibrium dynamics has not been investigated. In this paper we present comprehensive results, from Monte Carlo simulations, on coarsening dynamics in a system, over a wide range of temperature, in space dimension d = 3, for which there exists roughening transition at a nonzero temperature. State-of-the-art analysis of the simulation data, on structure, growth and aging, shows that the onset of unexpected glass-like slow dynamics in this system, that has received much attention in recent times, for quenches to zero temperature, actually occurs at this transition point. This demonstrates an important structure-dynamics connection in phase-ordering dynamics. We compare the key results with those from d = 2, for which there exists no non-zero roughening transition temperature. Absence of the above mentioned anomalous features in the latter dimension places our conjecture on the role of roughening transition on a firmer footing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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