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Title: Anomalous electronic structure and magnetoresistance in TaAs2

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep27294· OSTI ID:1259958
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

We report that 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. In conclusion, 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1259958
Report Number(s):
LA-UR-16-20463
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Cited By (27)

Thermoelectric signature of the chiral anomaly in Cd3As2 journal October 2016
Pressure-induced superconductivity in topological semimetal NbAs2 journal November 2018
Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3 journal November 2019
Semi-metals as potential thermoelectric materials journal June 2018
Anisotropic transverse magnetoresistance and Fermi surface in TaSb2 journal July 2018
Magneto-resistance in pristine and irradiated TaAs 2 journal April 2019
Robust magnetoresistance in TaAs 2 under pressure up to about 37 GPa journal September 2019
Nonsaturating large magnetoresistance in semimetals journal October 2018
Optical signatures of Dirac nodal lines in NbAs 2 journal December 2018
Quantum transport in Dirac and Weyl semimetals: a review journal May 2017
On the search for the chiral anomaly in Weyl semimetals: the negative longitudinal magnetoresistance journal August 2016
Hidden Weyl points in centrosymmetric paramagnetic metals journal March 2017
Quantum oscillations and nontrivial topological state in a compensated semimetal TaP 2 journal September 2019
Topological crystalline insulator state with type-II Dirac fermions in transition metal dipnictides journal November 2019
Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs journal December 2017
Nonmonotonic magnetoresistance of a two-dimensional viscous electron-hole fluid in a confined geometry journal February 2018
Nontopological origin of the planar Hall effect in the type-II Dirac semimetal NiTe 2 journal April 2019
Hidden Weyl points in centrosymmetric paramagnetic metals text January 2017
Hidden Weyl Points in Centrosymmetric Paramagnetic Metals text January 2016
Weyl and Dirac Semimetals in Three Dimensional Solids text January 2017
Nonmonotonic magnetoresistance of a two-dimensional viscous electron-hole fluid in a confined geometry text January 2017
Extreme magnetoresistance in the topologically trivial lanthanum monopnictide LaAs text January 2018
Optical Signatures of Dirac Nodal-lines in NbAs$_2$ text January 2018
Origin of the butterfly magnetoresistance in a Dirac nodal-line system text January 2019
Robust magnetoresistance in TaAs2 under pressure up to about 37 GPa text January 2019
Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3 text January 2020
Magnetoresistance and robust resistivity plateau in MoAs2 journal November 2017

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