Negative longitudinal magnetoresistance as a sign of a possible chiral magnetic anomaly in the half-Heusler antiferromagnet DyPdBi

Abstract

Magnetotransport investigation of a half-Heusler antiferromagnet DyPdBi revealed hallmark features of Weyl semimetal: huge negative longitudinal magnetoresistance and planar Hall effect. Both effects have recently been linked to chiral magnetic anomaly - axial charge pumping between Weyl nodes. Magnetoresistance (MR) of single crystals of DyPdBi is very pronounced. In magnetic field longitudinal to electrical current direction it reaches -80% and its relative difference with respect to that measured in transverse field (expressed as anisotropic magnetoresistance) is extremely strong: -60% at 10K and 14 T. The planar Hall effect in DyPdBi depends on temperature and magnetic field in non-monotonous way, which has not been previously reported. We compare magnetoresistance measured with voltage contacts on mid-line of the sample with that measured with contacts on its edge, and show that the role of current-jetting, an extrinsic source of anisotropic negative magnetoresistance, is marginal. We discuss that nature of the compound and sample quality exclude intrinsic sources of negative and anisotropic magnetoresistance other than weak localization and the chiral magnetic anomaly.

arXiv comment19 pages, 8 figures

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• Longitudinal magnetoconductance and the planar Hall effect in a lattice model of tilted Weyl fermions
• Transverse thermopower in Dirac and Weyl semimetals
• Giant magnetoresistance, Fermi surface topology, Shoenberg effect and vanishing quantum oscillations in type-II Dirac semimetal candidates MoSi${}_2$ and WSi${}_2$
• Magnetotransport signatures of chiral magnetic anomaly in the half-Heusler phase ScPtBi
• Insulating Half-Heusler TmPdSb with Unusual Band Order and Metallic Surface States
• Tuning of anomalous magnetotransport properties in half-Heusler topological semimetal GdPtBi
• Topological Aspects of Antiferromagnets
• Structural and transport properties of 4f electron doped Y1-x(Dy)xPdBi topological semi-metallic thin films
• Origin of the large topological Hall effect in the EuCd${}_2$Sb${}_2$ antiferromagnet
• Transverse and Longitudinal Magnetothermopower Promoted by Ambipolar Effect in Half-Heusler Topological Materials
• Anomalous magnetotransport in the single-crystalline half-Heusler antiferromagnet ErPdSb
• Magnetic and electrical transport properties of the single-crystalline half-Heusler antiferromagnet DyNiSb