论文标题
域结构动态动力学中的kagome-lattice weyl semimetal co $ _3 $ sn $ _2 $ s $ _2 $
Domain structure dynamics in the ferromagnetic Kagome-lattice Weyl semimetal Co$_3$Sn$_2$S$_2$
论文作者
论文摘要
CO $ _3 $ sn $ _2 $ s $ _2 $，由kagome晶格组成的Weyl半学分，从高温磁磁阶段过渡到177 k以下的低温铁磁相。早些时候，“ A”期与竞争性的抗铁磁相，旋转玻璃相和某些间接测量结果表明在此阶段有磁空的可能性。我们已经在不同温度，磁场和磁力显微镜下的磁场，磁场和磁角的单个晶体中成像了磁域结构。在低温下，我们观察到条纹结构域，表明存在单轴各向异性。在130 K以上，域墙变得可移动，当磁场沿$ C $轴增加时，它们往往比$ a-b $平面相对容易地对齐。我们对依赖场域动力学的详细研究表明，相当于$ t_c $的相变的异常性质主要由域壁运动控制。
Co$_3$Sn$_2$S$_2$, a Weyl semimetal that consists of layers of Kagome lattices, transitions from a high-temperature paramagnetic phase to a low-temperature ferromagnetic phase below 177 K. The phase transition occurs through an intermediate non-trivial magnetic phase, the so-called "A"-phase just below the Curie temperature. The "A"-phase was earlier linked with a competing anti-ferromagnetic phase, a spin-glass phase and certain indirect measurements indicated the possibility of magnetic Skyrmions in this phase. We have imaged the magnetic domain structure in a single crystal of Co$_3$Sn$_2$S$_2$ at different temperatures, magnetic fields and field-angles by magnetic force microscopy. At low temperatures, we observed stripe domains indicating presence of uniaxial anisotropy. Above 130 K, the domain walls become mobile and they tend to align relatively easily when the magnetic field is increased along the $c$-axis than in the $a-b$ plane. Our detailed study of field-dependent domain dynamics reveal that the anomalous nature of the phase transition just below $T_c$ is dominantly governed by domain wall motion.
