论文标题
磁性Weyl Semimetal Co $ _ {3} $ sn $ _ {2} $ S $ _ {2}
Evidence of Ferromagnetic Clusters and Griffiths Singularity in Magnetic Weyl Semimetal Co$ _{3} $Sn$ _{2} $S$ _{2} $
论文作者
论文摘要
成分配方co $ _ {3} $ a $ _ {2} $ s $ _ {2} $（a = sn and in）的基于钴的硫化物被抑制了沮丧的Kagome晶格结构和许多由拓扑结构确定的新现象。在此处，我们报告了对铁电磁化合物Co $ _ {3} $ sn $ _ {2} $ s $ _ {2} $在磁场$ h $下使用C-axis $（H \ partallel c）$（H \ abplane $ ab）$（H $）$（H $）$（H $）的详细探索。在场冷却和零场冷却的磁化和记忆效应测量方案中，揭示了低温聚类的磁性磁性行为。在临界温度高于临界温度上方的逆敏感性中观察到的急剧下降和非线性性能在pramagnetic区域中的$ t _ {\ text {c}} $证实，证实了$ t _ {\ text {c}} $ in co $ $ _ {3} $ _ {3} $ _ {3} $ _ {3} $的短距离速率clusters的存在。顺磁性状态中线性居里 - 韦斯行为的偏差表示材料中的强烈奇异性。慢速自旋动力学行为和零自发磁化在$ t _ {\ text {c}} $上方，给出了由于铁磁簇的证据。源自磁化的Arott图揭示了低场区域的凸型曲率，并在高场区域中呈线性正行为，从而证实了CO $ _ {3} $ sn $ _ {2} $ s $ s $ _ {2} $的二阶磁相变。高桥旋转波动理论分析为CO $ _ {3} $ sn $ _ {2} $ s $ _ {2} $中流动的铁磁性提供了足够的证据。大型磁结晶各向异性与高各向异性场的伴随性表明强旋轨道偶联现象的主导地位。我们的实验结果强调了对基于CO的Shandite系统中存在的磁性复杂性质的直观理解。
Cobalt based sulphides of compositional formula Co$ _{3} $A$ _{2} $S$ _{2} $ (A = Sn and In) are endowed with frustrated kagome lattice structure and a plethora of novel phenomena determined from the topological band structure. Here-in, we report on the detailed exploration of anisotropic magnetic properties of single crystals of ferromagnetic compound Co$ _{3} $Sn$ _{2} $S$ _{2} $ under magnetic field $H$ applied along the c-axis $(H\parallel c)$ and the ab-plane $(H\parallel ab)$. A low temperature clustered-glassy magnetic behaviour is revealed in field-cooled and zero field-cooled magnetization and memory effect measurement protocols. The sharp downturn and non-linearity observed in the inverse susceptibility above the critical temperature $T _{\text{C}} $ in the paramagnetic region corroborates to the presence of short-range ferromagnetic clusters above $ T _{\text{C}} $ in Co$ _{3} $Sn$ _{2} $S$ _{2} $. The deviation from linear Curie-Weiss behaviour in the paramagnetic state signifies the strong Griffiths singularity in the material. The slow spin dynamics behaviour and zero spontaneous magnetization above $ T _{\text{C}} $ give an evidence of Griffiths phase owing to the ferromagnetic clusters. The Arrott plots derived from magnetization reveal convex type curvature at low fields and linear positive behavior in the high field region, confirming the second order magnetic phase transition in Co$ _{3} $Sn$ _{2} $S$ _{2} $. The Takahashi spin fluctuation theory analysis provides sufficient evidence for itinerant ferromagnetism in Co$ _{3} $Sn$ _{2} $S$ _{2} $. A large magneto-crystalline anisotropy concomitant with a high anisotropy field suggests the dominance of strong spin orbit coupling phenomenon. Our experimental results emphasize an intuitive understanding of the complex nature of magnetism present in Co-based shandite systems.
