论文标题
MNSC $ _2 $ S $ _4 $的磁序阶段中的旋转激发
Spin excitations in the magnetically ordered phases of MnSc$_2$S$_4$
论文作者
论文摘要
最近的中子散射实验表明，沮丧的磁相互作用会导致MNSC $ _2 $ s $ _4 $的抗铁磁螺旋和分数Skyrmion晶格阶段。在这里，为了追踪这些调制阶段的签名，我们研究了THz光谱的MNSC $ _2 $ _2 $ s $ _4 $的自旋激发，最高为12 t。我们发现了一个单个磁共振，具有线性增加的现场频率。 Mn $^{2+} $ G $ g $ g $ = 1.96的相应$ g $ -FACTOR，并且缺乏其他共鸣意味着非常弱的各向异性和更高谐波对螺旋状态的贡献可忽略不计。在我们的实验中，直流磁敏感性与最低频率AC敏感性之间的显着差异意味着在100 GHz以下的模式存在。
Recent neutron scattering experiments suggested that frustrated magnetic interactions give rise to antiferromagnetic spiral and fractional skyrmion lattice phases in MnSc$_2$S$_4$. Here, to trace the signatures of these modulated phases, we studied the spin excitations of MnSc$_2$S$_4$ by THz spectroscopy at 300 mK up to 12 T. We found a single magnetic resonance with linearly increasing frequency in field. The corresponding $g$-factor of Mn$^{2+}$ ions $g$ = 1.96, and the absence of other resonances imply very weak anisotropies and negligible contribution of higher harmonics to the spiral state. The significant difference between the dc magnetic susceptibility and the lowest-frequency ac susceptibility in our experiment implies the existence of mode(s) below 100 GHz.
