Abstract
AbstractItinerant ferromagnets constitute an important class of materials wherein spin polarization can affect the electric transport properties in nontrivial ways. One such phenomenon is anomalous Hall effect which depends on the details of the band structure such as the amount of band crossings in the valence band of the ferromagnet. Here, extraordinary anomalous Hall effect is found in an itinerant ferromagnetic metal LaCrSb3. The rather 2D nature of the magnetic subunit imparts large anisotropic anomalous Hall conductivity of 1250 Ω−1 cm−1 at 2 K. The investigations suggest that a strong Berry curvature by abundant momentum‐space crossings and narrow energy‐gap openings are the primary sources of the anomalous Hall conductivity. An important observation is the existence of quasi‐dispersionless bands in LaCrSb3 which is now known to increase the anomalous Hall conductivity. After introducing f‐electrons, anomalous Hall conductivity experiences more than twofold increase and reaches 2900 Ω−1 cm−1 in NdCrSb3.
Highlights
Nontrivial band topology features a unique electronic structure that describes the origin of the quantum Hall effect, which exists with many variants
The 3d3 states of Cr3+ in each CrSb6 octahedron experience the highest crystal field energy, and they favorably split into eg and t2g energy levels, which are the main source of magnetism in this material (Figure 1c right panel)
For cases where a mixed contribution of Berry phase and side-jump dominates, n is predicted to be 1.6.[32]. Surprisingly, our estimation of n = 3 for NdCrSb3 goes beyond this power law and calls for more accurate scaling law
Summary
Nontrivial band topology features a unique electronic structure that describes the origin of the quantum Hall effect, which exists with many variants. A comparatively large spontaneous Hall effect, termed the anomalous Hall effect (AHE), is known to exist in magnetic materials in which the Bloch wave function of electrons is asymmetric in momentum space. In this scenario, electrons acquire an additional group velocity in the presence of a driving perturbation, such as an external electric field. Electrons acquire an additional group velocity in the presence of a driving perturbation, such as an external electric field This anomalous velocity is perpendicular to the applied electric field, giving rise to an additional value to the Hall effect, i.e., AHE.[1] In addition, the group velocity is drastically enhanced by virtue of the Berry phase of nontrivial bands, which provides a strong fictitious field
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