Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV3Sb5

Shuo-Ying Yang; Yaojia Wang; Brenden R Ortiz; Defa Liu; Jacob Gayles; Elena Derunova; Rafael Gonzalez-Hernandez; Libor Šmejkal; Yulin Chen; Stuart S P Parkin; Stephen D Wilson; Eric S Toberer; Tyrel McQueen; Mazhar N Ali

doi:10.1126/sciadv.abb6003

Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV₃Sb₅

Sci Adv. 2020 Jul 31;6(31):eabb6003. doi: 10.1126/sciadv.abb6003. eCollection 2020 Jul.

Authors

Shuo-Ying Yang¹, Yaojia Wang¹, Brenden R Ortiz², Defa Liu¹, Jacob Gayles^{3

4}, Elena Derunova¹, Rafael Gonzalez-Hernandez^{5

6}, Libor Šmejkal^{6

7

8}, Yulin Chen⁹, Stuart S P Parkin¹, Stephen D Wilson², Eric S Toberer¹⁰, Tyrel McQueen¹¹, Mazhar N Ali¹

Affiliations

¹ Max Planck Institute of Microstructure Physics, Halle, Germany.
² University of California at Santa Barbara, Santa Barbara, California 93106, USA.
³ Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.
⁴ Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
⁵ Universidad del Norte, Barranquilla, Colombia.
⁶ Johannes Gutenberg University of Mainz, Mainz, Germany.
⁷ Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Praha 6, Czech Republic.
⁸ Charles University, Prague, Czech Republic.
⁹ Oxford Department of Physics, Oxford, England.
¹⁰ Colorado School of Mines, Goldon, Colorado 80401, USA.
¹¹ Johns Hopkins University, Baltimore, Maryland 21218, USA.

Abstract

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.

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