Giant anomalous Hall and anomalous Nernst Conductivities in Antiperovskites and their Tunability via Magnetic Fields

TL;DR

This study uses first-principles calculations to reveal giant anomalous Hall and Nernst conductivities in ferromagnetic antiperovskites, which can be tuned via magnetic field-induced magnetization changes, with potential applications in spin-caloritronics.

Contribution

It provides the first comprehensive evaluation of AHC and ANC in 35 ferromagnetic antiperovskites and demonstrates their tunability through magnetic field manipulation.

Findings

Giant AHC and ANC observed in specific antiperovskites.

Weyl nodes near Fermi energy cause large ANC.

Magnetization direction controls AHC and ANC magnitude and sign.

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 evaluated the AHC and ANC of 35 cubic ferromagnetic antiperovskites (APVs) and observed giant AHC and ANC as large as 1128 S/cm and 6.27 AK-1m-1 for Co3LiN and Co3PtN, 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 Co3PtN. Interestingly, both the magnitude and sign of AHC and ANC can be tuned by changing the magnetization (M) directions, which could be applied to realize spin-caloritronics devices.