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arXiv 1606.05076cond-mat.stat-mech
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蜂窝晶格上阻挫Ising反铁磁体的三临界行为

Tricritical behaviour of the frustrated Ising antiferromagnet on the honeycomb lattice

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

摘要:

我们使用有效场论和基于不同团簇尺寸的关联来研究蜂窝晶格上的阻挫伊辛反铁磁体的相图,其中最近邻自旋对之间的强度$J_1 < 0$和次最近邻自旋对之间的强度$J_2 < 0$具有各向同性相互作用。我们目前的结果作为阻挫参数$R = J_2 /|J_1|$的函数的基态能量。我们发现团簇的大小对相图中三临界点的存在和位置有很大的影响,在三临界点处,相变从二级转变为一级。

英文摘要:

We use the effective-field theory with correlations based on different cluster sizes to investigate phase diagrams of the frustrated Ising antiferromagnet on the honeycomb lattice with isotropic interactions of the strength $J_1 < 0$ between nearest-neighbour pairs and $J_2 < 0$ between next-nearest neighbour pairs of spins. We present results for the ground-state energy as a function of the frustration parameter $R = J_2 /|J_1|$. We find that the cluster-size has a considerable effect on the existence and location of a tricritical point in the phase diagram at which the phase transition changes from the second order to the first one.

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