  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.
