Unconventional Anomalous Hall Effect in the Canted Antiferromagnetic Half‐Heusler Compound DyPtBi

Abstract

Abstract The interplay between magnetism and the topological band in metamagnetic materials has attracted researchers’ attentions because these materials exhibit novel phenomena, such as the anomalous Hall effect (AHE) and quantum AHE. Here, the magnetotransport of DyPtBi single crystals in out‐of‐plane and in‐of‐plane magnetic field configurations is investigated. The results show a large unconventional anomalous Hall signal in the canted Type II antiferromagnetic state, indicating the existence of significant Berry curvature. This signal evolves into a large hump with DyPtBi entering the paramagnetic state and persists up to temperatures that are much higher than T N . Out‐of‐plane and in‐of‐plane measurements indicate that a larger unconventional Hall signal is observed at certain θ and ϕ angles. A giant planar anomalous Hall angle (AHA) of up to 30% is achieved in DyPtBi, which is comparable to that in a typical ferromagnetic Weyl semimetal. The results show that DyPtBi is a good platform for investigating the unconventional AHE and other novel physical properties in various potentially topologically nontrivial phases due to the interplay between canted antiferromagnetic structures and topology.