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arXiv 1609.06196cond-mat.stat-mech
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蜂窝晶格上阻挫伊辛反铁磁体的理论研究

Theoretical Study of the Frustrated Ising Antiferromagnet on the Honeycomb Lattice

A. Bobák, T. Lučivjanský, M. Žukovič, M. Borovský, T. Balcerzak

AI总结:

本研究用含关联的有效场理论,探究次次近邻反铁磁作用对蜂窝晶格阻挫自旋-1/2 J₁-J₂-J₃伊辛反铁磁体的影响,发现特定J₃<0区域存在三临界点,对应奈尔反铁磁-顺磁相界上的二级到一级相变转变。

摘要:

我们采用含关联的有效场理论,研究了次次近邻反铁磁($J_3 < 0$)相互作用对蜂窝晶格上阻挫自旋-$\frac{1}{2}$ $J_1-J_2-J_3$伊辛反铁磁体临界特性(或相图)的影响。除基态能量外,我们发现在$J_3 < 0$的区域内,该阻挫蜂窝晶格反铁磁体存在一个三临界点,在奈尔反铁磁相和顺磁相的分界线上,相变在该点从二级转变为一级。

英文摘要:

We study effects of the next-next-nearest-neighbour antiferromagnetic ($J_3 < 0$) interaction on critical properties (or phase diagram) of the frustrated spin-$\frac{1}{2}$ $J_1-J_2-J_3$ Ising antiferromagnet on the honeycomb lattice by using the effective-field theory with correlations. Beside the ground-state energy, we find that there is a region of $J_3 < 0$ in which the frustrated honeycomb lattice antiferromagnet exhibits a tricritical point, at which the phase transition changes from the second order to the first one on the line between Néel antiferromagnetic and paramagnetic phases.

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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