Unusual magnetic and transport properties in HoMn$_6$Sn$_6$ kagome magnet

TL;DR

This study explores the magnetic, transport, and electronic properties of HoMn$_6$Sn$_6$, a kagome magnet, revealing topological effects, pressure-induced magnetic changes, and Dirac-like electronic dispersions, advancing understanding of rare-earth kagome materials.

Contribution

It provides the first detailed investigation of topological Hall effect, pressure effects, and Dirac-like dispersions in HoMn$_6$Sn$_6$, a rare-earth kagome magnet.

Findings

Observation of topological Hall effect and anomalous Hall effect above 100 K.

Pressure effects on magnetic ordering at low magnetic fields.

Detection of Dirac-like dispersion near the Fermi level supported by calculations.

Abstract

With intricate lattice structures, kagome materials are an excellent platform to study various fascinating topological quantum states. In particular, kagome materials, revealing large responses to external stimuli such as pressure or magnetic field, are subject to special investigation. Here, we study the kagome-net HoMn$_6$Sn$_6$ magnet that undergoes paramagnetic to ferrimagnetic transition (below 376 K) and reveals spin-reorientation transition below 200 K. In this compound, we observe the topological Hall effect and substantial contribution of anomalous Hall effect above 100 K. We unveil the pressure effects on magnetic ordering at a low magnetic field from the pressure tunable magnetization measurement. By utilizing high-resolution angle-resolved photoemission spectroscopy, Dirac-like dispersion at the high-symmetry point K is revealed in the vicinity of the Fermi level, which is well supported by the first-principles calculations, suggesting a possible Chern-gapped Dirac cone in this compound. Our investigation will pave the way to understand the magneto-transport and electronic properties of various rare-earth-based kagome magnets.