Topological Hall Effect induced by chiral fluctuations in a Kagome Lattice

The Topological Hall effect (THE) is a hallmark of chiral spin interactions in noncollinear magnetic structures. An outstanding question is whether chiral interactions could exist and induce a THE in a material with a collinear structure as predicted theoretically for a fluctuating chiral order. We report the presence of the Topological Hall Effect in the Kagome material ErMn 6 Sn 6 . Using magnetization and neutron scattering data we confirm the presence of a field-induced ferrimagnetic (FiM) to antiferromagnetic (AFM) transition and the collinear magnetic structure of these phases. We then calculate the strength of the THE and show that it is present and strongly anisotropic. A mapping of the magnitude of THE shows it correlates with the boundary of the field-induced phase transition.