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arXiv · 1803.03439

Strong anomalous Nernst effect in collinear magnetic Weyl semimetals without net magnetic moments

Jonathan Noky·Jacob Gayles·Claudia Felser·Yan Sun
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Abstract

We predict a large anomalous Nernst effect in the inverse Heusler compensated ferrimagnets Ti$_2$Mn$X$ ($X$=Al,Ga,In) with vanishing net magnetic moments. Though the net magnetic moment is zero, the Weyl points in these systems lead to a large anomalous Nernst conductivity (ANC) due to the lack of a magnetic sublattice that inverses the sign of the Berry curvature. In comparison to the noncollinear antiferromagnets Mn$_3$Sn and Mn$_3$Ge, the high ANC stems almost entirely from the Weyl points in this class of compounds, and thus, it is topologically protected. This work shows for the first time a large ANC with zero net magnetic moments in collinear systems, which is helpful for comprehensive understanding of the thermoelectric effect in zero-moment magnetic materials and its further applications.

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Jonathan Noky, Jacob Gayles, Claudia Felser, Yan Sun. 2020-03-27. Strong anomalous Nernst effect in collinear magnetic Weyl semimetals without net magnetic moments. https://doi.org/10.1103/physrevb.97.220405

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