论文标题
拓扑厅效应和Nowotney Chimney Ladder Compound Cr $ _ {11} $ GE $ _ {19} $}的磁状态
Topological Hall effect and the magnetic states of Nowotney chimney ladder compound Cr$_{11}$Ge$_{19}$}
论文作者
论文摘要
我们已经研究了Nowotney Chimney Ladder Comp $ _ {11} $ GE $ _ {19} $的单晶的磁性和电荷传输性能，并绘制了一个全面的相图，反映了Dzyaloshinskii-Moriya（DM）相互作用之间复杂的相互作用，并进行了偶性相互作用，并进行了磁性Anissoctactaction和MaintectAnissos。我们已经确定了一组有趣的磁性阶段，并将有限的拓扑厅效应归因于最近发现的双 - 凯尔米阶段。这些数据还表明，在有限田地存在抗锁骨状态，该状态在磁性排序温度以下$ t_c $的温度下，这表明，拓扑厅效应的符号明显变化所表明。高于$ t_c $，我们发现了一个增强的磁反应区域，该区域对应于小磁场下的铁磁临界点附近可能存在的无序相。强烈的旋转手性波动是通过持续1 t的拓扑厅电阻率的巨大值证明的，这很可能是由于DM相互作用的存在。我们认为，对拓扑厅效应的变化对应于由磁性偶极和DM相互作用控制的不同拓扑自旋纹理，这些纹理与温度的重要性不同。
We have investigated the magnetic and charge transport properties of single crystals of Nowotney Chimney Ladder compound Cr$_{11}$Ge$_{19}$ and mapped out a comprehensive phase diagram reflecting the complicated interplay between the Dzyaloshinskii-Moriya (DM) interaction, the dipolar interaction, and the magnetic anisotropy. We have identified a set of interesting magnetic phases and attributed a finite topological Hall effect to the recently discovered bi-skyrmion phase. These data also suggest the existence of an anti-skyrmion state at finite fields for temperatures just below the magnetic ordering temperature, $T_c$, as indicated by a distinct change in sign of the topological Hall effect. Above $T_c$, we discovered a region of enhanced magnetic response corresponding to a disordered phase likely existing near the ferromagnetic critical point under small magnetic fields. Strong spin chirality fluctuations are demonstrated by the large value of the topological Hall resistivity persisting up to 1 T which is most likely due to the existence of the DM interaction. We argue that changes to the topological Hall effect correspond to different topological spin textures that are controlled by magnetic dipolar and DM interactions that vary in importance with temperature.
