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arXiv 1410.8397cond-mat.stat-mech
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三维各向异性自旋玻璃模型的关键问题

Critical aspects of three-dimensional anisotropic spin-glass models

T. Papakonstantinou, N. G. Fytas, A. Malakis, I. Lelidis

摘要:

研究了简单立方晶格上具有纵向各向异性键随机性的$\pm J$三维伊辛模型。随机交换相互作用仅适用于$z$方向,而在其他两个方向,$xy$ -平面,我们考虑铁磁交换。通过实施一个有效的并行回火计划,我们概述了该模型的相图,并将其与相应的各向同性的,以及以前研究的各向异性(横向)的情况下。我们对铁磁-顺磁和自旋玻璃-顺磁跃迁线进行了详细的有限尺寸标度分析,并讨论了铁磁-自旋玻璃跃迁区。我们的结论是,目前的模型共享相同的普适类的各向同性模型,但在对称点有一个相当高的转变温度从自旋玻璃态的顺磁相。我们的铁磁-自旋玻璃转变线的数据支持的各向同性模型的重入行为相比,向前的行为。

英文摘要:

We study the $\pm J$ three-dimensional Ising model with a longitudinal anisotropic bond randomness on the simple cubic lattice. The random exchange interaction is applied only in the $z$ direction, whereas in the other two directions, $xy$ - planes, we consider ferromagnetic exchange. By implementing an effective parallel tempering scheme, we outline the phase diagram of the model and compare it to the corresponding isotropic one, as well as to a previously studied anisotropic (transverse) case. We present a detailed finite-size scaling analysis of the ferromagnetic - paramagnetic and spin glass - paramagnetic transition lines, and we also discuss the ferromagnetic - spin glass transition regime. We conclude that the present model shares the same universality classes with the isotropic model, but at the symmetric point has a considerably higher transition temperature from the spin-glass state to the paramagnetic phase. Our data for the ferromagnetic - spin glass transition line are supporting a forward behavior in contrast to the reentrant behavior of the isotropic model.

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