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arXiv 1402.6069cond-mat.str-el
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单Q无公度磁结构的线性自旋波理论

Linear spin wave theory for single-Q incommensurate magnetic structures

S. Toth, B. Lake

摘要:

线性自旋波理论提供了计算长程有序磁系统的激发谱作为$1/\sqrt{S}$的函数的主导项。这一项是使用Holstein-Primakoff近似的自旋算子和有效的小$δS$波动的有序时刻。我们提出了一种算法,允许磁基态与一般的力矩方向和单Q非公度有序波矢量使用一个本地坐标变换的每个自旋和旋转坐标变换的不可压缩性。最后,我们显示,我们的模型可以如何确定的自旋波谱的磁性C位langasites与无公度秩序。

英文摘要:

Linear spin wave theory provides the leading term in the calculation of the excitation spectra of long-range ordered magnetic systems as a function of $1/\sqrt{S}$. This term is acquired using the Holstein-Primakoff approximation of the spin operator and valid for small $δS$ fluctuations of the ordered moment. We propose an algorithm that allows magnetic ground states with general moment directions and single-Q incommensurate ordering wave vector using a local coordinate transformation for every spin and a rotating coordinate transformation for the incommensurability. Finally we show, how our model can determine the spin wave spectrum of the magnetic C-site langasites with incommensurate order.

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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