Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV 3 Sb 5 .

Autor: Yang SY; Max Planck Institute of Microstructure Physics, Halle, Germany., Wang Y; Max Planck Institute of Microstructure Physics, Halle, Germany., Ortiz BR; University of California at Santa Barbara, Santa Barbara, California 93106, USA., Liu D; Max Planck Institute of Microstructure Physics, Halle, Germany., Gayles J; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.; Department of Physics, University of South Florida, Tampa, Florida 33620, USA., Derunova E; Max Planck Institute of Microstructure Physics, Halle, Germany., Gonzalez-Hernandez R; Universidad del Norte, Barranquilla, Colombia.; Johannes Gutenberg University of Mainz, Mainz, Germany., Šmejkal L; Johannes Gutenberg University of Mainz, Mainz, Germany.; Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Praha 6, Czech Republic.; Charles University, Prague, Czech Republic., Chen Y; Oxford Department of Physics, Oxford, England., Parkin SSP; Max Planck Institute of Microstructure Physics, Halle, Germany., Wilson SD; University of California at Santa Barbara, Santa Barbara, California 93106, USA., Toberer ES; Colorado School of Mines, Goldon, Colorado 80401, USA., McQueen T; Johns Hopkins University, Baltimore, Maryland 21218, USA., Ali MN; Max Planck Institute of Microstructure Physics, Halle, Germany.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2020 Jul 31; Vol. 6 (31), pp. eabb6003. Date of Electronic Publication: 2020 Jul 31 (Print Publication: 2020).
DOI: 10.1126/sciadv.abb6003
Abstrakt: 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 KV 3 Sb 5 , 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, KV 3 Sb 5 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.
(Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze: MEDLINE
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