Extremely large anomalous Hall conductivity and unusual axial diamagnetism in a quasi-1D Dirac material LaMgBi
arXiv:2310.11378 · doi:10.1002/adma.202400166
Abstract
Anomalous Hall effect (AHE), one of the most important electronic transport phenomena, generally appears in ferromagnetic materials but is rare in materials without magnetic elements. Here, we present a study of LaMgBi, whose band structure carries multitype Dirac fermions. Although magnetic elements are absent in LaMgBi, clear signals of AHE can be observed. In particular, the anomalous Hall conductivity is extremely large, reaching 42,356 cm with an anomalous Hall angle of 8.8 %, the largest one that has been observed in the current AHE systems. The AHE is suggested to originate from the combination of skew scattering and Berry curvature. Another unique property discovered in LaMgBi is the axial diamagnetism. The diamagnetism is significantly enhanced and dominates the magnetization in the axial directions, which is the result of restricted motion of the Dirac fermion at Fermi level. Our findings not only establish LaMgBi as a suitable platform to study AHE and quantum transport, but also indicate the great potential of 315-type Bi-based materials for exploring novel physical properties.
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