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arXiv 0705.1935cond-mat.str-el
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S=1/2准一维阻挫Ising反铁磁体的场致三临界行为

Field induced tricritical behavior in the S=1/2 quasi one-dimensional frustrated Ising antiferromagnet

E. Meloche, M. L. Plumer

摘要:

本文用扩展直方图簇热浴蒙特卡罗模拟方法研究了堆积三角晶格上准一维伊辛反铁磁体的临界行为。一个小的应用领域,诱导交叉从XY的普遍性,平均场三临界行为。临界指数的实验估计表明,这两种类型的相变中观察到S=1 CsNiCl $_3$和$S=1/2$ CsCoBr $_3$,分别。目前的研究结果表明,这种差异可以解释由一个不寻常的交错磁场所产生的量子交换混合先前提出的占自旋激发$S=1/2$准一维伊辛反铁磁体。

英文摘要:

The results of extensive histogram cluster heat-bath Monte Carlo simulations on the critical behavior of the quasi-one dimensional Ising antiferromagnet on a stacked triangular lattice are presented. A small applied field is shown to induce a crossover from XY universality to mean-field tricritical behavior. Experimental estimates of critical exponents suggest that these two types of phase transitions are observed in S=1 CsNiCl$_3$ and $S=1/2$ CsCoBr$_3$, respectively. The present results demonstrate that this difference can be explained by an unusual staggered magnetic field arising from quantum exchange mixing previously proposed to account for spin excitations in $S=1/2$ quasi-one-dimensional Ising antiferromagnets.

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。

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