用μ子自旋转动研究MnGe手征磁体的磁基态和自旋涨落
Magnetic ground state and spin fluctuations in MnGe chiral magnet as studied by Muon Spin Rotation
摘要：
利用μ子自旋共振（μSR）研究了最近在MnGe手征磁体中观察到的螺旋基态和起伏手征相位。在低温下，μ子极化在短时间尺度上呈现双周期振荡。他们的分析类似于最近开发的MnSi [A. Amato等人，Phys.Rev.B89，184425（2014）]提供了对在μ子位点处由Mn螺旋序诱导的场分布的估计。改进的μ介子位置与从头计算结果吻合得很好。随着温度的升高，一个不均匀的波动手性相集，其特征在于两个良好分离的频率范围内共存的样品。在T $_{N}$ = 170 K以下的大温度范围内，分别与短程有序螺旋和长程有序螺旋有关的快涨落和慢涨落共存。考虑到MnGe的短螺旋周期、亚稳淬灭态和特殊的能带结构，我们讨论了MnSi的结果。
英文摘要：
We have studied by muon spin resonance (μSR) the helical ground state and fluctuating chiral phase recently observed in the MnGe chiral magnet. At low temperature, the muon polarization shows double period oscillations at short time scales. Their analysis, akin to that recently developed for MnSi [A. Amato et al., Phys. Rev. B 89, 184425 (2014)], provides an estimation of the field distribution induced by the Mn helical order at the muon site. The refined muon position agrees nicely with ab initio calculations. With increasing temperature, an inhomogeneous fluctuating chiral phase sets in, characterized by two well separated frequency ranges which coexist in the sample. Rapid and slow fluctuations, respectively associated with short range and long range ordered helices, coexist in a large temperature range below T$_{N}$ = 170 K. We discuss the results with respect to MnSi, taking the short helical period, metastable quenched state and peculiar band structure of MnGe into account.
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