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

Zhu, Yanglin; Gui, Xin; Wang, Yu; Graf, David; Xie, Weiwei; Hu, Jin; Mao, Zhiqiang

doi:10.1103/physrevb.101.035133

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

Journal Article · 17 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.101.035133 · OSTI ID:1593552

^[1]; Gui, Xin ^[2]; Wang, Yu ^[3]; Graf, David ^[4]; Xie, Weiwei ^[2]; Hu, Jin ^[5]; Mao, Zhiqiang ^[3]

Pennsylvania State Univ., University Park, PA (United States); University of Arkansas, Fayetteville, AR (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Pennsylvania State Univ., University Park, PA (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Univ. of Arkansas, Fayetteville, AR (United States)

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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Research Organization:: Univ. of Arkansas, Fayetteville, AR (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019467

OSTI ID:: 1593552

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Shubnikov-de Haas effect
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quantum transport
topological phases of matter

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

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