Anomalous hall effect in a ferromagnetic kondo system

Topology and strong electronic correlations are essential components to observe emergent phenomena in novel quantum materials, although their intersection in experimental systems has not been extensively studied yet. Recently theoretical calculations predicted that strong electronic correlations incorporated with crystalline symmetry could lead to topological gapless states. Here we study a ferromagnetic Kondo lattice system with nonsymmorphic crystal structure, which is designed to observe topological gapless states in the presence of strong electronic correlations. We observed anomalous hall effect, with a sign change of anomalous hall conductivity upon cooling the system. The change of sign of anomalous hall conductivity cannot be attributed to skew scattering as the direction of the magnetic order is not changed.  Instead, scaling analysis indicates that the anomalous Hall conductivity at low temperatures is dominated by the non-trivial Berry curvature. The possible topological state in ferromagnetic Kondo lattice system provides a unique opportunity to explore the effect of topology in strongly correlated systems.