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Title: Anomalous electronic structure and magnetoresistance in TaAs 2

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 TaAs 2 possesses a very large negative magnetoresistance, with an unknown scattering mechanism. In conclusion, density functional calculations find that TaAs 2 is a new topological semimetal [Z 2 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.
Authors:
 [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)
Publication Date:
Report Number(s):
LA-UR-16-20463
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1259958

Luo, Yongkang, McDonald, R. D., Rosa, P. F. S., Scott, B., Wakeham, N., Ghimire, N. J., Bauer, E. D., Thompson, J. D., and Ronning, F.. Anomalous electronic structure and magnetoresistance in TaAs2. United States: N. p., Web. doi:10.1038/srep27294.
Luo, Yongkang, McDonald, R. D., Rosa, P. F. S., Scott, B., Wakeham, N., Ghimire, N. J., Bauer, E. D., Thompson, J. D., & Ronning, F.. Anomalous electronic structure and magnetoresistance in TaAs2. United States. doi:10.1038/srep27294.
Luo, Yongkang, McDonald, R. D., Rosa, P. F. S., Scott, B., Wakeham, N., Ghimire, N. J., Bauer, E. D., Thompson, J. D., and Ronning, F.. 2016. "Anomalous electronic structure and magnetoresistance in TaAs2". United States. doi:10.1038/srep27294. https://www.osti.gov/servlets/purl/1259958.
@article{osti_1259958,
title = {Anomalous electronic structure and magnetoresistance in TaAs2},
author = {Luo, Yongkang and McDonald, R. D. and Rosa, P. F. S. and Scott, B. and Wakeham, N. and Ghimire, N. J. and Bauer, E. D. and Thompson, J. D. and Ronning, F.},
abstractNote = {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.},
doi = {10.1038/srep27294},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {1}
}