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arXiv 0809.0512cond-mat.stat-mech
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格点旋转对称性破缺的受抑海森堡模型中的一级无公度相变

First-Order Transition to Incommensurate Phase with Broken Lattice Rotation Symmetry in Frustrated Heisenberg Model

Ryo Tamura, Naoki Kawashima

摘要:

采用蒙特卡罗方法研究了具有铁磁最近邻相互作用$J_1$和反铁磁第三最近邻相互作用$J_3$的三角晶格二维经典海森堡模型中的有限温度相变。除了对应于O(3)自旋旋转的平凡简并度外,$J_3 \neq 0$的基态具有对应于120度晶格旋转的三倍简并度。我们发现,当相互作用比为$J_3/J_1=-3$时,该模型表现出一级相变和三重对称性破缺。

英文摘要:

We study a finite-temperature phase transition in the two-dimensional classical Heisenberg model on a triangular lattice with a ferromagnetic nearest-neighbor interaction $J_1$ and an antiferromagnetic third-nearest-neighbor interaction $J_3$ using a Monte Carlo method. Apart from a trivial degeneracy corresponding to O(3) spin rotations,the ground state for $J_3 \neq 0$ has a threefold degeneracy corresponding to 120 degree lattice rotations. We find that this model exhibits a first-order phase transition with the breaking of the threefold symmetry when the interaction ratio is $J_3/J_1=-3$.

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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