Topological Nernst effect, anomalous Nernst effect, and anomalous thermal Hall effect in the Dirac semimetal Fe3Sn2

Abstract

Topological semimetals have been a focal point of research in recent years. One of the salient characters of topological semimetals is the anomalous Hall effect arising from the nontrivial momentum-space Berry phase. In contrast, the anomalous transverse thermoelectric coefficient and thermal Hall effect have been much less explored to date. In this paper, we report thermoelectric and thermal transport properties of ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$, a prototypical Dirac semimetal. We find that ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ exhibits a large topological Nernst effect which is associated with the nonzero spin chirality of the skyrmion bubble phase. Furthermore, ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ shows a prominent anomalous thermal Hall effect and the anomalous Nernst effect with features similar to the anomalous Hall effect. The anomalous Nernst signal is about $2.1\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{V}/\mathrm{K}$ at room temperature, which is comparable to the largest value reported thus far. These results highlight the synergic effects of the Berry phase in both real space and momentum space of ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$, and this study demonstrates an effective strategy of investigating topological materials by measuring their transverse thermal and thermoelectric responses.