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Metastable states influence on the magnetic behavior of the triangular lattice: Application to the spin-chain compound Ca3Co2O6

机译：亚稳状态影响三角形的磁性行为   晶格：应用于自旋链化合物Ca3Co2O6

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摘要

It is known that the spin-chain compound Ca3Co2O6 exhibits very interestingplateaus in the magnetization as a function of the magnetic field at lowtemperatures. The origin of them is still controversial. In this paper we studythe thermal behavior of this compound with a single-flip Monte Carlo simulationon a triangular lattice and demonstrate the decisive influence of metastablestates in the splitting of the ferrimagnetic 1/3 plateau below 10 K. Weconsider the [Co2O6]n chains as giant magnetic moments described by large Isingspins on planar clusters with open boundary conditions. With this simplefrozen-moment model we obtain stepped magnetization curves which agree quitewell with the experimental results for different sweeping rates. We describeparticularly the out-of-equilibrium states that split the low-temperature 1/3plateau into three steps. They relax thermally to the 1/3 plateau, which haslong-range order at the equilibrium. Such states are further analyzed withsnapshots unveiling a domain-wall structure that is responsible for theobserved behavior of the 1/3 plateau. A comparison is also given of the exactresults in small triangular clusters with our Monte Carlo results, providingfurther support for our thermal description of this compound.
机译：已知在低温下，自旋链化合物Ca3Co2O6在磁化强度方面表现出非常有趣的平稳状态，这是磁场的函数。它们的起源仍然有争议。在本文中，我们通过单翻转蒙特卡罗模拟在三角形晶格上研究了该化合物的热行为，并证明了亚稳态在10 K以下亚铁磁1/3平台分裂中的决定性影响。我们认为[Co2O6] n链为大型Isingspins在具有开放边界条件的平面簇上描述的巨大磁矩。通过这种简单的冻结时刻模型，我们获得了阶梯式磁化曲线，该曲线与不同扫掠速率的实验结果非常吻合。我们特别描述了将低温1/3平台分为三个步骤的失衡状态。它们热松弛到1/3平台，该平台在平衡时具有长程有序。通过快照分析这些状态，揭示了一个域墙结构，该结构负责观察到的1/3平稳状态。还对小三角形簇中的精确结果与我们的蒙特卡洛结果进行了比较，为我们对该化合物的热描述提供了进一步的支持。

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