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arXiv 1202.5854cond-mat.str-el
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阻挫整数自旋修正的Shastry-Sutherland模型的精确基态

Exact ground state of a frustrated integer-spin modified Shastry-Sutherland model

Johannes Richter, Heinz-Jürgen Schmidt

摘要:

考虑了一个二维几何阻挫整数自旋海森堡系统,该系统具有一个精确的基态。该系统对应于一个具有两个耦合常数J1和J2的装饰正方形晶格,可以理解为一个推广的Shastry-Sutherland模型.自旋模型的主要元素是适当耦合的反铁磁自旋三聚体与整数自旋量子数s和他们的基态Φ将是三聚体的本地单重基态的产物状态。我们提供了精确的数值数据有限晶格以及分析的考虑,以估计依赖于两个耦合常数J2和J1的比率和自旋量子数s的存在范围。此外,我们发现,磁化曲线作为一个功能的应用磁场显示平台和跳跃。在经典极限s \to \infty中,该模型表现出三维和二维基态的相位,该相位由在饱和磁化强度的1/3处的一维(共线)平台态分离。

英文摘要:

We consider a two-dimensional geometrically frustrated integer-spin Heisenberg system that admits an exact ground state. The system corresponds to a decorated square lattice with two coupling constants J1 and J2, and it can be understood as a generalized Shastry-Sutherland model. Main elements of the spin model are suitably coupled antiferromagnetic spin trimers with integer spin quantum numbers s and their ground state Phi will be the product state of the local singlet ground states of the trimers. We provide exact numerical data for finite lattices as well as analytical considerations to estimate the range of the existence in dependence on the ratio of the two couplings constants J2 and J1 and on the spin quantum number s. Moreover, we find that the magnetization curves as a function of the applied magnetic field shows plateaus and jumps. In the classical limit s \to \infty the model exhibits phases of three- and two-dimensional ground states separated by a one-dimensional (collinear) plateau state at 1/3 of the saturation magnetization.

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