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arXiv 1706.07441cond-mat.stat-mech
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外场诱导三维各向同性海森堡反铁磁体的相变

Phase transition induced for external field in tree-dimensional isotropic Heisenberg antiferromagnet

Minos A. Neto, J. Roberto Viana, Octavio D. R. Salmon, E. Bublitz Filho, J. Ricardo de Sousa

摘要:

本文报道了纵向磁场作用下各向同性海森堡反铁磁模型的平均场和有效场重整化群计算。如已经知道的,这些方法,表示为MFRG和EFRG,是基于两个不同大小的集群的比较,它们中的每一个试图模仿某些布拉维晶格。我们的注意力一直在温度-磁场平面上的临界前沿的获得,对于简单立方和体心立方晶格。我们使用具有$N=1,2,4$自旋的团簇来实现MFRG-12、EFRG-12和EFRG-24数值方程。因此,由此产生的前沿线表明,EFRG方法克服了MFRG问题时,集群的较大尺寸被认为是。

英文摘要:

In this paper, we report mean-field and effective-field renormalization group calculations on the isotropic Heisenberg antiferromagnetic model under a longitudinal magnetic field. As is already known, these methods, denoted by MFRG and EFRG, are based on the comparison of two clusters of different sizes, each of them trying to mimic certain Bravais lattice. Our attention has been on the obtantion of the critical frontier in the plane of temperature versus magnetic field, for the simple cubic and the body-centered cubic lattices. We used clusters with $N=1,2,4$ spins so as to implement MFRG-12, EFRG-12 and EFRG-24 numerical equations. Consequently, the resulting frontier lines show that EFRG approach overcomes the MFRG problems when clusters of larger sizes are considered.

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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