Observation of room temperature Topological Hall Effect in Van der Waal ferromagnet Fe₅GeTe₂

Here we report a novel electrical Topological Hall response in the absence of a Lorentz Force in Fe₅GeTe₂ that survives up to room temperature. The origin of this Hall like response is likely due to the intrinsic topological magnetic defects such as anti-merrons.  Measurements of off diagonal thermal quantities reveals similarly intriguing results. All such quantities have been measured with field along the plane.  However, severe differences between samples that have differing thermal histories is observed and is likely linked to the melting of magnetic order of the Fe(1) sublattice, though additional origins will be discussed. High resolution TEM was utilized to better understand the structure of quenched and slow cooled samples. We will discuss the multiple possible origins of this response. The possible origins of this behavior will be examined.