Anisotropically large anomalous and topological Hall effect in a kagome magnet

Recently, kagome materials have caught massive attention due to 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. In this talk, we discuss magnetic, magneto-transport, and angle-resolved photoemission spectroscopy measurements of a kagome magnet ErMn₆Sn₆ that undergoes antiferromagnetic (T_N = 345 K) to ferrimagnetic (T_C = 68 K) phase transitions in the presence of the 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.