arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0910.4162cond-mat.str-el
收藏

Shastry-Sutherland晶格上自旋1/2 XXZ模型的磁性:长程相互作用的影响

Magnetic properties of the spin-1/2 XXZ model on the Shastry-Sutherland lattice: Effect of long-range interactions

Takahumi Suzuki, Yusuke Tomita, Naoki Kawashima

摘要:

利用量子Monte Carlo方法研究了具有长程相互作用的Shastry-Sutherland晶格上的$S=1/2$ Ising-like XXZ模型的磁性.该模型示出了当考虑额外的耦合时,在饱和磁化强度的二分之一和三分之一处的磁化平台阶段。我们调查有限温度过渡到一半和三分之一平台阶段。所得结果表明,前一种情况为一阶,后一种情况为二阶。我们还发现,虽然在Ising极限情况下只有一个相变,但在二维伊辛模型的普适性下,系统经历了两个连续的相变.最后,我们估计耦合比来解释在${\rm TmB_4}$中观察到的磁化过程

英文摘要:

We study magnetic properties of the $S=1/2$ Ising-like XXZ model on the Shastry-Sutherland lattices with long-range interactions, using the quantum Monte Carlo method. This model shows magnetization plateau phases at one-half and one-third of the saturation magnetization when additional couplings are considered. We investigate the finite temperature transition to one-half and one-third plateau phases. The obtained results suggest that the former case is of the first order and the latter case is of the second order. We also find that the system undergoes two successive transitions with the 2D Ising model universality, although there is a single phase transition in the Ising limit case. Finally, we estimate the coupling ratio to explain the magnetization process observed in ${\rm TmB_4}$

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。

↑