Abstract
A giant planar Hall effect (PHE) and anisotropic magnetoresistance (AMR) is observed in TaP, a nonmagnetic Weyl semimetal with ultrahigh mobility. The perpendicular resistivity (i.e., the planar magnetic field applied normal to the current) far exceeds the zero-field resistivity, which thus rules out the possible origin of negative longitudinal magnetoresistance. The giant PHE/AMR is finally attributed to the large anisotropic orbital magnetoresistance that stems from the ultrahigh mobility. Furthermore, the mobility-enhanced current jetting effects are found to strongly deform the line shape of the curves, and their evolution with the changing magnetic field and temperature is also studied. Although the giant PHE/AMR suggests promising applications in spintronics, the enhanced current jetting shows the other side of the coin, which needs to be considered in the future device design.
Highlights
Topological (Dirac and Weyl) semimetals (TSMs) attract fast growing interests for their intriguing properties, such as extremely large nonsaturating positive magnetoresistance (XMR) [1], chiral anomaly induced negative longitudinal MR (NLMR) [2], surface Fermi arcs [3,4], etc
The giant planar Hall effect (PHE) and anisotropic magnetoresistance (AMR) are attributed to the large anisotropic orbital magnetoresistance that stems from the ultrahigh mobility
The NLMR induced by chiral anomaly is crucial transport evidence for TSMs
Summary
Topological (Dirac and Weyl) semimetals (TSMs) attract fast growing interests for their intriguing properties, such as extremely large nonsaturating positive magnetoresistance (XMR) [1], chiral anomaly induced negative longitudinal MR (NLMR) [2], surface Fermi arcs [3,4], etc. Recent studies indicate that the measurement of NLMR can be affected by some extrinsic effects, like ionic impurity induced scattering [11], weak localization [12], conductivity fluctuation [13], and current jetting effect [14,15]. For the semimetals with high mobility (e.g., the TaP family), considerable concerns have been raised about the validity of NLMR, because the significantly enhanced current jetting effect can induce a large NLMR [14]. These techniques include the measurements of anomalous Hall effect [16], anomalous Nernst effect [17,18], and nonlinear optical response [19]
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