Anisotropically large anomalous and topological Hall effect in a kagome magnet

TL;DR

This study investigates the large anomalous and topological Hall effects in the kagome magnet ErMn6Sn6, revealing strong anisotropy, field-dependent topological phenomena, and complex electronic structure, advancing understanding of topology-magnetism interplay.

Contribution

It provides comprehensive transport, magnetic, and spectroscopic analysis of ErMn6Sn6, highlighting its tunable topological and magnetic properties and their correlation with electronic structure.

Findings

Large anomalous and topological Hall effects observed.

Strong magnetic anisotropy and field-dependent topological phenomena.

Spectroscopic and theoretical results reveal complex kagome electronic structure.

Abstract

Recently, kagome materials have become an engrossing platform to study the interplay among symmetry, magnetism, topology, and electron correlation. The latest works on RMn6Sn6 (R = rare earth metal) compounds have illustrated that this family could be intriguing to investigate various physical phenomena due to large spin-orbit coupling and strong magnetic ordering. However, combined transport and spectroscopic studies in RMn6Sn6 materials are still limited. Here, we report magnetic, magneto-transport, and angle-resolved photoemission spectroscopy measurements of a kagome magnet ErMn6Sn6 that undergoes antiferromagnetic (TN = 345 K) to ferrimagnetic (TC = 68 K) phase transitions in the presence of field. We observe large anomalous and topological Hall effects serving as transport signatures of the nontrivial Berry curvature. The isothermal magnetization exhibits strong anisotropic nature and the topological Hall effect of the compound depends on the critical field of metamagnetic transition. Our spectroscopic results complemented by theoretical calculations show the multi-orbital kagome fermiology. This work provides new insight into the tunability and interplay of topology and magnetism in a kagome magnet.