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

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

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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.

Original language	English
Article number	abb6003
Journal	Science Advances
Volume	6
Issue number	31
DOIs	https://doi.org/10.1126/sciadv.abb6003
State	Published - Jul 2020
Externally published	Yes

Funding

This research was supported by the Alexander von Humboldt Foundation Sofia Kovalevskaja Award, the MINERVA ARCHES Award, and shared facilities of the UCSB MRSEC (NSF DMR 1720256). B.R.O. acknowledges support from the California NanoSystems Institute through the Elings Fellowship program. B.R.O. and S.D.W. acknowledge partial support provided via the UC Santa Barbara NSF Quantum Foundry funded under the Q-AMASE-i initiative under award DMR-1906325. D.L. acknowledges the support from the Alexander von Humboldt Foundation. L.S. acknowledges EU FET Open RIA grant no. 766566. L.S. and R.G.-H. acknowledge the use of the supercomputer Mogon at JGU (hpc.uni-mainz.de), the Transregional Collaborative Research Center (SFB/TRR) 173 SPIN+X, the Grant Agency of the Czech Republic grant no. 19-18623Y, and support from the Institute of Physics of the Czech Academy of Sciences and the Max Planck Society through the Max Planck Partner Group programme. E.S.T. and B.R.O. acknowledge the NSF award 1555340. T.M. acknowledges the David and Lucile Packard Foundation and the Johns Hopkins University Catalyst Award. S.S.P.P. acknowledge European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement no. 670166), Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-project number 314790414, and Alexander von Humboldt Foundation in the framework of the Alexander von Humboldt Professorship endowed by the Federal Ministry of Education and Research.

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Yang, S. Y., Wang, Y., Ortiz, B. R., Liu, D., Gayles, J., Derunova, E., Gonzalez-Hernandez, R., Šmejkal, L., Chen, Y., Parkin, S. S. P., Wilson, S. D., Toberer, E. S., McQueen, T., & Ali, M. N. (2020). Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KV₃Sb₅. Science Advances, 6(31), Article abb6003. https://doi.org/10.1126/sciadv.abb6003

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

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.",

author = "Yang, {Shuo Ying} and Yaojia Wang and Ortiz, {Brenden R.} and Defa Liu and Jacob Gayles and Elena Derunova and Rafael Gonzalez-Hernandez and Libor {\v S}mejkal and Yulin Chen and Parkin, {Stuart S.P.} and Wilson, {Stephen D.} and Toberer, {Eric S.} and Tyrel McQueen and Ali, {Mazhar N.}",

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AU - Gayles, Jacob

AU - Derunova, Elena

AU - Gonzalez-Hernandez, Rafael

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AU - Chen, Yulin

AU - Parkin, Stuart S.P.

AU - Wilson, Stephen D.

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AU - Ali, Mazhar N.

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

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