  Searching for a high anomalous Nernst effect (ANE) is crucial for
thermoelectric energy conversion applications because the associated unique
transverse geometry facilitates module fabrication. Topological ferromagnets
with large Berry curvatures show high ANEs; however, they face drawbacks such
as strong magnetic disturbances and low mobility due to high magnetization.
Herein, we demonstrate that YbMnBi2, a canted antiferromagnet, has a large ANE
conductivity of ~10 Am-1K-1 that surpasses the common high values (i.e. 3-5
Am-1K-1) observed so far in ferromagnets. The canted spin structure of Mn
guarantees a nonzero Berry curvature but generates only a weak magnetization
three orders of magnitude lower than that of general ferromagnets. The heavy Bi
with a large spin-orbit coupling enables a high ANE and low thermal
conductivity, whereas its highly dispersive px/y orbitals ensure low
resistivity. The high anomalous transverse thermoelectric performance and
extremely small magnetization makes YbMnBi2 an excellent candidate for
transverse thermoelectrics.
