# Anisotropic Topological Hall Effect with Real and Momentum Space Berry Curvature in the Antiskrymion Hosting Heusler Compound Mn$_{1.4}$PtSn

## TL;DR

This paper reports a large, anisotropic topological Hall effect in Mn$_{1.4}$PtSn, driven by both real and momentum space Berry curvatures, revealing new insights into topological magnetic textures in this compound.

## Contribution

It demonstrates the coexistence of real and momentum space Berry curvature contributions to the topological Hall effect in Mn$_{1.4}$PtSn, a novel observation in this material.

## Key findings

- Large THE of 0.9 μΩcm comparable to anomalous Hall effect
- THE persists below 170 K in the noncoplanar spin phase
- Simultaneous contributions from real and momentum space Berry curvature

## Abstract

The topological Hall effect (THE) is one of the key signatures of topologically non-trivial magnetic spin textures, wherein electrons feel an additional transverse voltage to the applied current. The magnitude of THE is often small compared to the anomalous Hall effect. Here, we find a large THE of 0.9 $\mu\Omega$cm that is of the same order of the anomalous Hall effect in the single crystalline antiskyrmion hosting Heusler compound Mn$_{1.4}$PtSn, a non-centrosymmetric tetragonal compound. The THE is highly anisotropic and survives in the whole temperature range where the spin structure is noncoplanar (<170 K). The THE is zero above the spin reorientation transition temperature of 170 K, where the magnetization will have a collinear and ferromagnetic alignment. The large value of the THE entails a significant contribution from the momentum space Berry curvature along with real space Berry curvature, which has never been observed earlier.