ISING TRANSITION IN FRUSTRATED HEISENBERG MODELS
ISING TRANSITION IN FRUSTRATED HEISENBERG MODELS
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DOI：
10.1103/physrevlett.64.88
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发表时间：
1990-01-01
影响因子：
8.6
通讯作者：
LARKIN, AI
中科院分区：
文献类型：
--
作者：
CHANDRA, P;COLEMAN, P;LARKIN, AI
我们推导了二维方形海森堡模型的尺度方程，其中挫折自发地破坏了z4晶格对称。在短距离时，模型表现为两个相互穿透的nsamel子晶格。短波波动耦合这些子晶格，驱动跨界到远距离的单晶格行为，并产生伊辛阶参数。当自旋相关和交叉长度变得相当时，存在与亚晶格磁化的后续发展无关的有限温度Ising相变。
We derive scaling equations for a 2D square Heisenberg model where frustration spontaneously breaks the Z 4 lattice symmetry. At short distances, the model behaves as two interpenetrating Néel sublattices. Short-wavelength fluctuations couple these sublattices, driving a crossover to single-lattice behavior at long distances and generating an Ising order parameter. When the spin-correlation and crossover lengths become comparable, there exists a finite-temperature Ising phase transition independent of the subsequent development of a sublattice magnetization.