论文标题
晶格对磁性特性的影响和S = 1三角形反铁磁铁NIGA $ _2 $ S $ _4 $中的可能的自旋nematicity的影响
Impact of the lattice on magnetic properties and possible spin nematicity in the S=1 triangular antiferromagnet NiGa$_2$S$_4$
论文作者
论文摘要
Niga $ _2 $ S $ _4 $是三角形晶格s = 1系统，具有强大的二维晶格，并积极地作为候选人候选人，是由强二极管耦合带来的托管旋转循环订单。使用拉曼散射光谱，我们识别一个可以调节磁性交换$ J_1 $并产生四倍耦合的E $ _g $对称性的声子。此外，我们的拉曼散射结果表明冷却对局部反转对称性的损失，我们将其与硫空位相关联。这将导致dzyaloshinskii-moriya的差异无序，这可以防止远程磁性。使用磁性拉曼散射响应，我们将160〜K识别为磁相关上升的温度。低于160〜k的温度是抗铁磁磁性开始升高的50〜K，是旋转纽还是旋转状态的候选者。
NiGa$_2$S$_4$ is a triangular lattice S=1 system with strong two-dimensionality of the lattice, actively discussed as a candidate to host spin-nematic order brought about by strong quadrupole coupling. Using Raman scattering spectroscopy we identify a phonon of E$_g$ symmetry which can modulate magnetic exchange $J_1$ and produce quadrupole coupling. Additionally, our Raman scattering results demonstrate a loss of local inversion symmetry on cooling, which we associate with sulfur vacancies. This will lead to disordered Dzyaloshinskii-Moriya interactions, which can prevent long range magnetic order. Using magnetic Raman scattering response we identify 160~K as a temperature of an upturn of magnetic correlations. The temperature below 160~K, but above 50~K where antiferromagnetic magnetic start to increase, is a candidate for spin-nematic regime.
