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  • Title: Anomalous electronic structure and magnetoresistance in TaAs2.
    Author: Luo Y, McDonald RD, Rosa PF, Scott B, Wakeham N, Ghimire NJ, Bauer ED, Thompson JD, Ronning F.
    Journal: Sci Rep; 2016 Jun 07; 6():27294. PubMed ID: 27271852.
    Abstract:
    The change in resistance of a material in a magnetic field reflects its electronic state. In metals with weakly- or non-interacting electrons, the resistance typically increases upon the application of a magnetic field. In contrast, negative magnetoresistance may appear under some circumstances, e.g., in metals with anisotropic Fermi surfaces or with spin-disorder scattering and semimetals with Dirac or Weyl electronic structures. Here we show that the non-magnetic semimetal TaAs2 possesses a very large negative magnetoresistance, with an unknown scattering mechanism. Density functional calculations find that TaAs2 is a new topological semimetal [ℤ2 invariant (0;111)] without Dirac dispersion, demonstrating that a negative magnetoresistance in non-magnetic semimetals cannot be attributed uniquely to the Adler-Bell-Jackiw chiral anomaly of bulk Dirac/Weyl fermions.
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