Large anomalous Hall and Nernst effect in the breathing kagome ferromagnet NdCrGe 3

Abstract The anomalous Hall and Nernst effects provide critical probes for investigating the Berry-curvature-related electronic band characteristics in magnetic materials. In this study, we conducted a comprehensive investigation into the magnetic, electrical, and thermal transport properties of NdCrGe 3 single crystals with a Ge-based breathing kagome lattice. This compound undergoes a ferromagnetic transition at 128 K, and magnetic ordering of the Nd sublattice emerges below 100 K. Transport measurements indicate that NdCrGe 3 manifests large anomalous Hall conductivity with σ x y A ≈ 380 Ω − 1 ⋅ cm −1 at low temperatures and an anomalous Nernst coefficient with | S x y A - max | = 0.74 μV/K at 100 K. Scaling analysis reveals that NdCrGe 3 exhibits large intrinsic anomalous Hall conductivity of ∼260 Ω −1 ⋅cm −1 and falls within the intrinsic regime of the unified model. Furthermore, the anomalous Nernst coefficient breaks down the scaling relationship with magnetization observed in conventional ferromagnets, while the anomalous Nernst conductivity manifests a scaling behavior of T ln T . These results demonstrate that the anomalous transverse transport properties of NdCrGe 3 are predominantly governed by the intrinsic Berry mechanism.