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arXiv 1402.3463cond-mat.str-el
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空间各向异性阻挫反铁磁体中的自旋液相

Spin liquid phase in a spatially anisotropic frustrated antiferromagnet

Jaime Merino, Michael Holt, Ben J. Powell

摘要:

我们研究了三次近邻对各向异性三角晶格上海森堡模型磁性的影响。利用Schwinger-boson平均场论得到了该模型的相图。当改变最近邻交换耦合J_1、次最近邻交换耦合J_2和次最近邻交换耦合J_3的比例时,发现Néel、螺旋和共线磁有序相之间存在竞争。当J_3/J_1 < 0.1时,当J_2/J_1 < 1.8时,自旋液相稳定在螺旋有序态和共线有序态之间。最低能量的两个旋子色散相关的中子散射实验进行了分析和比较半经典磁振子色散发现显着差异的螺旋和共线相位之间的两种方法。结果进行了讨论的各向异性三角形材料的上下文中:Cs2 CuCl 4和Cs2 CuBr 4和层状有机材料,κ-(BEDT-TTF)2X和Y[Pd(dmit)2]2。

英文摘要:

We explore the effect of the third nearest-neighbors on the magnetic properties of the Heisenberg model on an anisotropic triangular lattice. We obtain the phase diagram of the model using Schwinger-boson mean-field theory. Competition between Néel, spiral and collinear magnetically ordered phases is found as we vary the on the ratios of the nearest, J1, next-nearest, J2, and third-nearest, J_3, neighbor exchange couplings. A spin liquid phase is stabilized between the spiral and collinear ordered states when J2/J1 < 1.8 for rather small J3/J1 < 0.1. The lowest energy two-spinon dispersions relevant to neutron scattering experiments are analyzed and compared to semiclassical magnon dispersions finding significant differences in the spiral and collinear phases between the two approaches. The results are discussed in the context of the anisotropic triangular materials: Cs2CuCl4 and Cs2CuBr4 and layered organic materials, kappa-(BEDT-TTF)2X and Y[Pd(dmit)2]2.

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