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Nontopological origin of the planar Hall effect in the type-Ⅱ Dirac semimetal NiTe_2

机译:Ⅱ型狄拉克半金属NiTe_2中平面霍尔效应的非拓扑起源

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摘要

We measure the low-temperature magnetic transport in a recently discovered type-II Dirac semimetal NiTe2 and successfully observe the planar Hall effect (PHE) which is often attributed to the chiral anomaly of topological electrons. The planar Hall signals oscillate with the in-plane angle with a pi period and reach the extremum at 45 degrees and 135 degrees, which can be ideally described by the theoretical formulas. However, by analyzing the in-plane anisotropic magnetoresistance, we find no negative longitudinal magnetoresistance. In addition, the rho(xx) - rho(yx) parametric plot exhibits a "shock-wave" pattern. All the evidence show that the presented PHE in NiTe2 originates from the trivial orbital magnetoresistance rather than the topological-nontrivial chiral anomaly.
机译:我们在最近发现的II型Dirac半金属NiTe2中测量了低温磁场的传输,并成功地观察到平面霍尔效应(PHE),该效应通常归因于拓扑电子的手性异常。平面霍尔信号以pi周期以平面内角振荡,并以45度和135度到达极值,这可以用理论公式理想地描述。然而,通过分析面内各向异性磁阻,我们没有发现负的纵向磁阻。另外,rho(xx)-rho(yx)参数图显示出“冲击波”模式。所有证据表明,NiTe2中存在的PHE来源于平凡的轨道磁阻,而不是拓扑非平凡的手性异常。

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