Rare earth engineering in RMn$_6$Sn$_6$ topological kagome magnets

TL;DR

This paper investigates RMn$_6$Sn$_6$ kagome magnets, revealing their topological quantum transport properties, including quantum oscillations and anomalous Hall effects, linked to massive Dirac fermions and the influence of rare-earth elements.

Contribution

It demonstrates how rare-earth elements can be used to engineer Chern quantum phases in kagome magnets through topological transport phenomena.

Findings

Observation of quantum oscillations with nontrivial Berry phase

Detection of large anomalous Hall effect from Berry curvature

Evidence of massive Dirac fermions in the material

Abstract

Exploration of the topological quantum materials with electron correlation is at the frontier of physics, as the strong interaction may give rise to new topological phases and transitions. Here we report that a family of kagome magnets RMn$_6$Sn$_6$ manifest the quantum transport properties analogical to those in the quantum-limit Chern magnet TbMn$_6$Sn$_6$. The topological transport in the family, including quantum oscillations with nontrivial Berry phase and large anomalous Hall effect arising from Berry curvature field, points to the existence of massive Dirac fermions. Our observation demonstrates a close relationship between rare-earth magnetism and topological electron structure, indicating the rare-earth elements can effectively engineer the Chern quantum phase in kagome magnets.