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arXiv 1902.04008cond-mat.str-el
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次近邻耦合下$Cs_2CuAl_4O_8$ - a键交替S=1/2自旋链中的磁振子激发

Magnon excitations in $Cs_2CuAl_4O_8$ - a bond alternating S=1/2 spin chain with next nearest neighbor coupling

Satyaki Kar

摘要:

最近的基于密度泛函理论(DFT)的分析,辅以量子蒙特卡罗计算,揭示了一维自旋- $\frac{1}{2}$化合物$Cs_2CuAl_4O_8$的高度自旋挫败性质,其包括独特的键交替和相对强的次近邻相互作用。本文简要介绍了在这种系统的基态中可能出现的磁振子激发。我们发现在共面螺旋参考态上得到的自旋波具有多重磁振子模(包括声学和光学)。然而,这些磁振子模式原来是稳定的,只有在没有键交替。

英文摘要:

A recent density functional theory (DFT) based analysis, complemented with Quantum Monte Carlo calculations revealed a highly spin-frustrating nature of the one-dimensional spin-$\frac{1}{2}$ compound $Cs_2CuAl_4O_8$ that comprises of unique bond alternations and relatively strong next nearest neighbor interactions. This article gives a brief account on possible magnon excitations that can appear in the ground state of such systems. We find that the spin waves obtained on top of coplanar helical reference states show multiple magnon modes (both acoustic and optical). However, those magnon modes turn out to be stable only in the absence of bond alternations.

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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