Field-induced Topological Hall effect in antiferromagnetic axion insulator candidate EuIn${}_2$As${}_2$

Abstract

The magnetic topological materials have attracted significant attention due to their potential realization of variety of novel quantum phenomena. EuIn${}_2$As${}_2$ has recently been theoretically recognized as a long awaited intrinsic antiferromagnetic bulk axion insulator. However, the experimental study on transport properties arising from the topological states in this material is scarce. In this paper, we perform the detailed magnetoresistance (MR) and Hall measurements to study the magnetotransport properties of this material. We find that the transport is strongly influenced by the spin configuration of the Eu moments from the concomitant change in the field dependence of the MR and that of the magnetization below the Néel temperature. Most importantly, an anomalous Hall effect (AHE) and a large topological Hall effect (THE) are observed. We suggest that the AHE is originated from a nonvanishing net Berry curvature due to the helical spin structure and that the THE is attributed to the formation of a noncoplanar spin texture with a finite scalar spin chirality induced by the external magnetic field in EuIn${}_2$As${}_2$. Our studies provide a platform to understand the influence of the interplay between the topology of electronic bands and the field-induced magnetic structure on magnetoelectric transport properties. In addition, our observations give a hint to realize axion insulator states and high-order topological insulator states through manipulating the magnetic state of EuIn${}_2$As${}_2$.

7 pages, 4 figures, accepted by Physical Review Reaseach

References in corpus (8)

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Cited by in corpus (5)

• Observation of colossal topological Hall effect in noncoplanar ferromagnet Cr5Te6 thin films
• Anisotropic magnetism and electronic structure of trigonal EuAl${}_2$Ge${}_2$ single crystals
• Superexchange Interaction in Insulating EuZn${}_2$P${}_2$
• Doping-tunable Fermi surface with persistent topological Hall effect in axion candidate EuIn${}_2$As${}_2$
• Incommensurate magnetic order in an axion insulator candidate EuIn${}_2$As${}_2$ investigated by NMR measurement