Evidence of ferromagnetic clusters in magnetic Weyl semimetal Co₃Sn₂S₂

Cobalt based sulfides of compositional formula Co₃A₂S₂ (A = Sn and In) are endowed with frustrated kagome lattice structure and a plethora of novel phenomena due to the topological band structure. We report on the detailed exploration of magnetic properties of single crystals of ferromagnetic Weyl semimetal Co₃Sn₂S₂. A non-linear behaviour observed in the inverse susceptibility above the critical temperature T_C in the paramagnetic state corroborates to the presence of short-range ferromagnetic clusters above T_C in Co₃Sn₂S₂. The upward deviation indicates the antiferromagnetic interactions between the nearest neighbouring magnetic clusters. The slow spin dynamics behaviour above T_C in isothermal remanent magnetization provide another evidence of ferromagnetic clusters. The magnetic hysteresis loops represent the magnetization reversal which, in turn, also confirm the short range magnetic correlations. Further, non-linear isothermal magnetization curves and zero spontaneous magnetization derived from corresponding Arrott plots above T_C prove the short range ferromagnetic clusters in Co₃Sn₂S₂. Our experimental results emphasize an intuitive understanding of the complex nature of magnetism present in Co-based shandite systems.