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2D ferromagnetic models with symmetry-breaking interactions: self-consistent harmonic approximation

机译:具有对称性破坏相互作用的二维铁磁模型:自洽谐波近似

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摘要

The 2D classical planar rotator, XY and Heisenberg ferromagnetic models with uniaxial in-plane anisotropy are investigated using self-consistent harmonic approximation. We found that for sufficiently large anisotropy there is implemented the phase transition from ferromagnetic phase into paramagnetic one. We also determine the range of anisotropy values for which the XY and planar rotator models undergo phase transition in temperature from the state with long-range magnetic order into Berezinskii-Kosterlitz-Thouless phase with topological order. The same calculations are carried out for the models with magnetoelastic coupling. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 15]
机译:使用自洽谐波近似研究具有单轴面内各向异性的二维经典平面转子,XY和Heisenberg铁磁模型。我们发现,对于足够大的各向异性,可以实现从铁磁相到顺磁相的相变。我们还确定了各向异性值的范围,其中XY和平面旋转器模型在温度下经历从具有长程磁阶的状态到具有拓扑序的Berezinskii-Kosterlitz-Thouless相的温度相变。对于具有磁弹性耦合的模型进行了相同的计算。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:15]

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