The anomalous Hall effect (AHE) is one of the most fundamental phenomena in physics. In the highly conductive regime, ferromagnetic metals have been the focus of past research. Here, we report a giant extrinsic AHE in KV3Sb5, an exfoliable, highly conductive semimetal with Dirac quasiparticles and a vanadium Kagome net. Even without report of long range magnetic order, the anomalous Hall conductivity reaches 15,507 Ω-1 cm-1 with an anomalous Hall ratio of ≈ 1.8%; an order of magnitude larger than Fe. Defying theoretical expectations, KV3Sb5 shows enhanced skew scattering that scales quadratically, not linearly, with the longitudinal conductivity, possibly arising from the combination of highly conductive Dirac quasiparticles with a frustrated magnetic sublattice. This allows the possibility of reaching an anomalous Hall angle of 90° in metals. This observation raises fundamental questions about AHEs and opens new frontiers for AHE and spin Hall effect exploration, particularly in metallic frustrated magnets.

Charles University Prague Czech Republic

Colorado School of Mines Goldon Colorado 80401 USA

Department of Physics University of South Florida Tampa Florida 33620 USA

Institute of Physics Czech Academy of Sciences Cukrovarnická 10 162 00 Praha 6 Czech Republic

Johannes Gutenberg University of Mainz Mainz Germany

Johns Hopkins University Baltimore Maryland 21218 USA

Max Planck Institute for Chemical Physics of Solids Dresden Germany

Max Planck Institute of Microstructure Physics Halle Germany

Oxford Department of Physics Oxford England

Universidad del Norte Barranquilla Colombia

University of California at Santa Barbara Santa Barbara California 93106 USA

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