Large Room Temperature Anomalous Nernst Effect Coupled with Topological Nernst Effect from Incommensurate Spin Structure in a Kagome Antiferromagnet

This study demonstrates that ErMn₆Sn₆, a kagome antiferromagnet hosting incommensurate spin textures, sustains finite scalar spin chirality that drives topological states. The anomalous Nernst effect (ANE) originates from the strong Berry curvature of Chern‐gapped Dirac fermions, while the topological Nernst effect (TNE) arises from emergent fields induced by scalar spin chirality, thereby revealing its promising thermoelectric potential. ABSTRACT Kagome magnets exhibit a range of novel and nontrivial topological properties due to the strong interplay between topology and magnetism, which also extends to their thermoelectric applications. Recent advances in the study of magnetic topological materials have highlighted their intriguing anomalous Hall and thermoelectric effects, arising primarily from large intrinsic Berry curvature. Here, we report observation of a large room‐temperature (RT) anomalous Nernst effects (ANE) of SxyA$S_{xy}^A$ ∼ 1.3 µV K−1 in the kagome antiferromagnet (AFM) ErMn6Sn6, which is comparable to the largest signals observed in known magnetic materials. Surprisingly, we further found that a significant topological Nernst signal at RT and peaking a maximum of approximately 0.2 µV K−1 at 180 K, exactly coupling with ANE in the spiral AFM state, originates from the real‐space nonzero spin chirality caused by incommensurate spin structure. This study demonstrates a potential room‐temperature thermoelectric application platform based on the Nernst effect, and provides insights for discovering significant anomalous and topological transverse transport effects in the Incommensurate spin texture, Kagome antiferromagnet, Thermoelectric effect, Topological Nernst effectincommensurate AFM system. This study demonstrates that ErMn₆Sn₆, a kagome antiferromagnet hosting incommensurate spin textures, sustains finite scalar spin chirality that drives topological states. The anomalous Nernst effect (ANE) originates from the strong Berry curvature of Chern-gapped Dirac fermions, while the topological Nernst effect (TNE) arises from emergent fields induced by scalar spin chirality, thereby revealing its promising thermoelectric potential. ABSTRACT Kagome magnets exhibit a range of novel and nontrivial topological properties due to the strong interplay between topology and magnetism, which also extends to their thermoelectric applications. Recent advances in the study of magnetic topological materials have highlighted their intriguing anomalous Hall and thermoelectric effects, arising primarily from large intrinsic Berry curvature. Here, we report observation of a large room-temperature (RT) anomalous Nernst effects (ANE) of SxyA$S_{xy}^A$ ∼ 1.3 µ V K −1 in the kagome antiferromagnet (AFM) ErMn 6 Sn 6, which is comparable to the largest signals observed in known magnetic materials. Surprisingly, we further found that a significant topological Nernst signal at RT and peaking a maximum of approximately 0.2 µ V K −1 at 180 K, exactly coupling with ANE in the spiral AFM state, originates from the real-space nonzero spin chirality caused by incommensurate spin structure. This study demonstrates a potential room-temperature thermoelectric application platform based on the Nernst effect, and provides insights for discovering significant anomalous and topological transverse transport effects in the Incommensurate spin texture, Kagome antiferromagnet, Thermoelectric effect, Topological Nernst effectincommensurate AFM system. Advanced Science, EarlyView.