Evidence from transport measurements for YRh6Ge4 being a triply degenerate nodal semimetal

Yanglin Zhu, Xin Gui, Yu Wang, David Graf, Weiwei Xie, Jin Hu, and Zhiqiang Mao
Phys. Rev. B 101, 035133 – Published 17 January 2020
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Abstract

We have investigated magnetotransport properties of YRh6Ge4, which was recently predicted to be a triply degenerate nodal semimetal. We find it exhibits remarkable signatures of a chiral anomaly, manifested by large negative longitudinal magnetoresistance, the quadratic field dependence of magnetoconductance and the planar Hall effect. Furthermore, we have also observed Shubnikov-de Haas (SdH) quantum oscillations in the magnetoresistivity measurements on this material. The analyses of the SdH data reveal two pointlike Fermi surfaces and these pockets are found to host nearly massless fermions. The small size of these Fermi pockets is in a good agreement with the theoretical prediction that the triply degenerate point in YRh6Ge4 is much closer to the Fermi level than previously demonstrated triply degenerate nodal semimetals such as MoP and WC. These results suggest YRh6Ge4 may serve as a model system to probe exotic properties of three-component fermions and understand their underlying physics.

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  • Received 21 September 2019
  • Revised 12 December 2019

DOI:https://doi.org/10.1103/PhysRevB.101.035133

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yanglin Zhu1, Xin Gui2, Yu Wang1, David Graf3, Weiwei Xie2, Jin Hu4,5, and Zhiqiang Mao1,*

  • 1Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 2Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
  • 3National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 4Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
  • 5Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA

  • *zim1@psu.edu

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Issue

Vol. 101, Iss. 3 — 15 January 2020

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