论文标题
$ s = \ frac {1} {2} $ s = \ frac {2} $三角形抗fiferRomagnet ca $ _3 $ reo $ _5 $ cl $ _2
Dimensional reduction and incommensurate dynamic correlations in the $S=\frac{1}{2}$ triangular-lattice antiferromagnet Ca$_3$ReO$_5$Cl$_2$
论文作者
论文摘要
在$ s = \ frac {1} {2} $三角形反铁磁铁ca $ _3 $ _3 $ _5 $ _5 $ cl $ _2 $中观察Spinon激发的观察，显示出磁性相关性的磁相关性质，以标志性的2D磁性结构，揭示了一种准二维（1d）的性质。这种现象被称为挫败感引起的尺寸还原。在这里，我们提出了CA $ _3 $ reo $ _5 $ cl $ cl $ _2 $的高场电子自旋共振光谱和磁化研究，这不仅使我们不仅可以完善自旋 - 哈米尔顿参数，而且还可以研究其低功能旋转动力学的特殊性。我们认为，均匀的Dzyaloshinskii-Moriya相互作用（DMI）的存在在动量空间中移动了Spinon连续体，因此，在$γ$点上打开了零场间隙。我们直接观察到这个差距。发现这种转移与有序状态下的结构调制是一致的，这表明该材料是完美的三角形晶格系统，在该系统中可以实现纯的DMI-s-pripal基态。
The observation of spinon excitations in the $S=\frac{1}{2}$ triangular antiferromagnet Ca$_3$ReO$_5$Cl$_2$ reveals a quasi-one-dimensional (1D) nature of magnetic correlations, in spite of the nominally 2D magnetic structure. This phenomenon is known as frustration-induced dimensional reduction. Here, we present high-field electron spin resonance spectroscopy and magnetization studies of Ca$_3$ReO$_5$Cl$_2$, allowing us not only to refine spin-Hamiltonian parameters, but also to investigate peculiarities of its low-energy spin dynamics. We argue that the presence of the uniform Dzyaloshinskii-Moriya interaction (DMI) shifts the spinon continuum in momentum space and, as a result, opens a zero-field gap at the $Γ$ point. We observed this gap directly. The shift is found to be consistent with the structural modulation in the ordered state, suggesting this material as a perfect model triangular-lattice system, where a pure DMI-spiral ground state can be realized.
