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

DOI: 10.1126/sciadv.abb6003 DOI Help

Authors: Shuo-Ying Yang (Max Planck Institute of Microstructure Physics) , Yaojia Wang (Max Planck Institute of Microstructure Physics) , Brenden R. Ortiz (University of California at Santa Barbara) , Defa Liu (Max Planck Institute of Microstructure Physics) , Jacob Gayles (Max Planck Institute for Chemical Physics of Solids; University of South Florida) , Elena Derunova (Max Planck Institute of Microstructure Physics) , Rafael Gonzalez-Hernandez (Universidad del Norte; Johannes Gutenberg University of Mainz) , Libor Šmejkal (Johannes Gutenberg University of Mainz; Institute of Physics, Czech Academy of Sciences; Charles University) , Yulin Chen (University of Oxford) , Stuart S. P. Parkin (Max Planck Institute of Microstructure Physics) , Stephen D. Wilson (University of California at Santa Barbara) , Eric S. Toberer (Colorado School of Mines) , Tyrel Mcqueen (Johns Hopkins University) , Mazhar N. Ali (Max Planck Institute of Microstructure Physics)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 6

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 22367

Open Access Open Access

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.

Diamond Keywords: Ferromagnetism

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Added On: 12/08/2020 10:46


Discipline Tags:

Quantum Materials Hard condensed matter - electronic properties Physics Magnetism Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)