Abstract

Kagome magnets are believed to have numerous exotic physical properties due to the possible interplay between lattice geometry, electron correlation and band topology. Here, we report the large anomalous Hall effect in the kagome ferromagnet LiMn$_6$Sn$_6$, which has a Curie temperature of 382 K and easy plane along with the kagome lattice. At low temperatures, unsaturated positive magnetoresistance and opposite signs of ordinary Hall coefficient for $\rho_{xz}$ and $\rho_{yx}$ indicate the coexistence of electrons and holes in the system. A large intrinsic anomalous Hall conductivity of 380 $\Omega^{-1}$ cm$^{-1}$, or 0.44 $e^2/h$ per Mn layer, is observed in $\sigma_{xy}^A$. This value is significantly larger than those in other $R$Mn$_6$Sn$_6$ ($R$ = rare earth elements) kagome compounds. Band structure calculations show several band crossings, including a spin-polarized Dirac point at the K point, close to the Fermi energy. The calculated intrinsic Hall conductivity agrees well with the experimental value, and shows a maximum peak near the Fermi energy. We attribute the large anomalous Hall effect in LiMn$_6$Sn$_6$ to the band crossings closely located near the Fermi energy.

Highlights

  • The magnet with a kagome lattice has been studied for a long time in the condensed matter physics and material science communities [1,2,3]

  • We attribute the large anomalous Hall effect in LiMn6Sn6 to the band crossings closely located near the Fermi energy

  • These experimental breakthroughs indicate that the kagome magnet is a promising system for investigating the interplay of lattice geometry, electron correlation, and band topology

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Summary

INTRODUCTION

The magnet with a kagome lattice has been studied for a long time in the condensed matter physics and material science communities [1,2,3]. The giant intrinsic anomalous Hall effect caused by the large Berry curvature have been observed in antiferromagnets Mn3Sn, Mn3Ge [6,7,8], and the magnetic Weyl semimetal Co3Sn2S2 [9,10] These experimental breakthroughs indicate that the kagome magnet is a promising system for investigating the interplay of lattice geometry, electron correlation, and band topology. We report a study on the magnetotransport properties of LiMn6Sn6, a member of the “166” material family with minimal number of valence electrons This compound is a ferromagnet with the Curie temperature (TC) of 382 K and has an easy plane parallel to the kagome lattice (ab plane). These results show that the large anomalous conductivity in LiMn6Sn6 is related to the band crossings near the EF

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