Title: "ErMn₆Sn₆ : A Novel Kagome Antiferromagnet for Advancing Room-Temperature Nernst Thermoelectrics"Oral: "ErMn₆Sn₆ : A Novel Kagome Antiferromagnet for Advancing Room-Temperature Nernst Thermoelectrics"

The Nernst effect, which involves the generation of a transverse electric voltage when subjected to a thermal gradient along the longitudinal direction, has become a focal point in magnetic topological materials due to its exceptional potential in thermoelectric technologies. This paper investigates the electronic and thermoelectric transport characteristics of ErMn₆Sn₆, a Kagome magnet that transitions from an incommensurate antiferromagnetic state to a ferrimagnetic state as the temperature drops. We find that, in its antiferromagnetic phase, ErMn₆Sn₆ exhibits both a topological and anomalous Nernst effect, akin to electric Hall effects. The Nernst coefficient reaches 1.71 µV K⁻¹ at 300 K and 3 T, surpassing most previously reported values for canted antiferromagnets, and is comparable to other RMn₆Sn₆ (R = rare-earth, Y, Lu, Sc) compounds. These results position ErMn₆Sn₆ as a strong candidate for the development of Nernst effect-based thermoelectric devices.