Giant anomalous Hall and anomalous Nernst conductivities in antiperovskites and their tunability via magnetic fields

Abstract

The anomalous Hall conductivity (AHC) and anomalous Nernst conductivity (ANC) are two prominent transport phenomena in ferromagnetic materials of a topological nature. Based on first-principles calculations, we evaluate the AHC and ANC of 35 cubic ferromagnetic antiperovskites (APVs) and observe giant AHC and ANC as large as 1128 S/cm and 6.31 ${\mathrm{AK}}^{\ensuremath{-}1}{\mathrm{m}}^{\ensuremath{-}1}$ for ${\mathrm{Co}}_{3}\mathrm{LiN}$ and ${\mathrm{Co}}_{3}\mathrm{PtN}$, respectively. Detailed analysis reveals that the origin of giant ANC can be attributed to the occurrence of Weyl nodes near the Fermi energy, as demonstrated for ${\mathrm{Co}}_{3}\mathrm{PtN}$. Interestingly, both the magnitude and sign of AHC and ANC can be tuned by changing the magnetization $(\mathbf{M})$ directions, which could be applied to realize spin-caloritronics devices.