Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2

Abstract

Recently discovered Dirac and Weyl semimetals display unusual magnetoresistance phenomena, including a large, non-saturating, linear transverse magnetoresistance and a negative longitudinal magnetoresistance. The latter is often considered as evidence of fermions having a defined chirality. Classical mechanisms, due to disorder or non-uniform current injection, can however, also produce negative longitudinal magnetoresistance. Here, we report on magnetotransport measurements performed on epitaxial thin films of Cd3As2, a three-dimensional Dirac semimetal. Quasi-linear positive transverse magnetoresistance and negative longitudinal magnetoresistance are observed. By evaluating films of different thickness and by correlating the temperature dependence of the carrier density and mobility with the magnetoresistance characteristics, we demonstrate that both the quasi-linear positive and the negative magnetoresistance are caused by conductivity fluctuations. Chiral anomaly is not needed to explain the observed features.

arXiv commentAccepted for publication as Rapid Communication in Physical Review B

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• Giant anisotropic magnetoresistance and planar Hall effect in the Dirac semimetal Cd3As2
• Giant Planar Hall Effect in the Dirac Semimetal ZrTe5
• A Large Effective Phonon Magnetic Moment in a Dirac Semimetal
• Probing the Chiral Anomaly by Planar Hall Effect in Three-dimensional Dirac Semimetal Cd3As2 Nanoplates
• Current jetting distorted planar Hall effect in a Weyl semimetal with ultrahigh mobility
• Evidence for a Dirac nodal-line semimetal in SrAs${}_3$
• Intrinsic negative magnetoresistance from the chiral anomaly of multifold fermions
• Molecular beam epitaxy of three-dimensionally thick Dirac semimetal Cd3As2 films
• Progress in epitaxial thin-film Na3Bi as a topological electronic material
• Negative magnetoresistance suppressed through topological phase transition in (Cd1-xZnx)3As2 films
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• Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Probing charge pumping and relaxation of the chiral anomaly in a Dirac semimetal
• Basal-plane growth of cadmium arsenide by molecular beam epitaxy
• Planar Hall-effect, Anomalous planar Hall-effect, and Magnetic Field-Induced Phase Transitions in TaAs
• Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $\alpha -$(BETS)${}_2$I${}_3$
• Intrinsic Contribution to Non-linear Thermoelectric Effect
• Tracking ultrafast change of multiterahertz broadband response functions in a photoexcited Dirac semimetal Cd${}_3$As${}_2$ thin film
• Epitaxial growth, magnetoresistance, and electronic band structure of GdSb magnetic semimetal films
• Planar Hall effect in Cu intercalated PdTe${}_2$
• Determination of the crystal field splitting energy in Cd3As2 using magnetooptics
• Evidence of decoupling of surface and bulk states in Dirac semimetal $C{d}_{3}A{s}_2$
• Inhomogeneous superconductivity and quasilinear magnetoresistance at amorphous LaTiO3/SrTiO3 interfaces
• Magnetotransport due to conductivity fluctuations in non-magnetic ZrTe2 nanoplates
• Constraints on proximity-induced ferromagnetism in a Dirac semimetal (Cd${}_3$As${}_2$)/ferromagnetic semiconductor (Ga${}_{1-x}$Mn${}_x$Sb) heterostructure
• Non-Ohmic negative longitudinal magnetoresistance in two-dimensional electron gas