Anomalous Hall effect in ferrimagnetic metal RMn6Sn6 (R = Tb, Dy, Ho) with clean Mn kagome lattice

TL;DR

This study investigates the magnetic and transport properties of RMn6Sn6 compounds with a kagome lattice, revealing significant anomalous Hall effects and magnetic structures, highlighting their potential for topological quantum phenomena.

Contribution

It provides a systematic analysis of RMn6Sn6 compounds, demonstrating large intrinsic anomalous Hall conductivities and magnetic structures, advancing understanding of kagome lattice materials.

Findings

Large intrinsic anomalous Hall conductivity observed in all compounds.

All compounds exhibit collinear ferrimagnetic structure with different easy axes.

Transport properties vary with temperature, showing positive MR at low T and negative MR at higher T.

Abstract

Kagome lattice, made of corner-sharing triangles, provides an excellent platform for hosting exotic topological quantum states. Here we systematically studied the magnetic and transport properties of RMn6Sn6 (R = Tb, Dy, Ho) with clean Mn kagome lattice. All the compounds have a collinear ferrimagnetic structure with different easy axis at low temperature. The low-temperature magnetoresistance (MR) is positive and has no tendency to saturate below 7 T, while the MR gradually declines and becomes negative with the increasing temperature. A large intrinsic anomalous Hall conductivity about 250 {\Omega}-1cm-1, 40 {\Omega}-1cm-1, 95 {\Omega}-1cm-1 is observed for TbMn6Sn6, DyMn6Sn6, HoMn6Sn6, respectively. Our results imply that RMn6Sn6 system is an excellent platform to discover other intimately related topological or quantum phenomena and also tune the electronic and magnetic properties in future studies.