Anisotropically large anomalous and topological Hall effect in a kagome magnet

Recently, kagome materials have become an engrossing platform to study the\ninterplay among symmetry, magnetism, topology, and electron correlation. The\nlatest works on RMn6Sn6 (R = rare earth metal) compounds have illustrated that\nthis family could be intriguing to investigate various physical phenomena due\nto large spin-orbit coupling and strong magnetic ordering. However, combined\ntransport and spectroscopic studies in RMn6Sn6 materials are still limited.\nHere, we report magnetic, magneto-transport, and angle-resolved photoemission\nspectroscopy measurements of a kagome magnet ErMn6Sn6 that undergoes\nantiferromagnetic (TN = 345 K) to ferrimagnetic (TC = 68 K) phase transitions\nin the presence of field. We observe large anomalous and topological Hall\neffects serving as transport signatures of the nontrivial Berry curvature. The\nisothermal magnetization exhibits strong anisotropic nature and the topological\nHall effect of the compound depends on the critical field of metamagnetic\ntransition. Our spectroscopic results complemented by theoretical calculations\nshow the multi-orbital kagome fermiology. This work provides new insight into\nthe tunability and interplay of topology and magnetism in a kagome magnet.\n