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Giant Anomalous Hall Effect in Kagome Nodal Surface Semimetal Fe$_3$Ge

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arxiv 2501.15424 v1 pith:ZDFIDLOC submitted 2025-01-26 cond-mat.mes-hall cond-mat.mtrl-sci

classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords anomaloushallkagomenodalsurfaceeffectgiantmaterials
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abstract

It is well known that the intrinsic anomalous Hall effect (AHE) arises from the integration of the non-zero Berry curvature (BC), conventionally observed in the Dirac/Weyl and nodal-line semimetals. Moreover, nodal surface semimetals are expected to exhibit more significant BC under the prevalence of degenerate points near the Fermi level. In this work, we report the detection of a giant AHE in the Kagome magnet Fe$_3$Ge with a two-dimensional (2D) nodal surface (NS) at $k_{z}=\pi$ plane, exhibiting an anomalous Hall conductivity (AHC) of 1500 $\Omega^{-1}$cm$^{-1}$ at 160 K, the highest among all reported Kagome topological materials. This finding suggests a new platform for searching large AHC materials and facilitates potential room-temperature applications in spintronic devices and quantum computing.

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  1. Large Berry curvature effects induced by extended nodal structures: Rational design strategy and high-throughput materials predictions

    cond-mat.mtrl-sci 2025-06 conditional novelty 6.0 of 10

    A symmetry-based screen predicts 60 magnetic materials with large intrinsic anomalous Hall conductivity driven by straight nodal lines and flat nodal surfaces.

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