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Title: Evidence from transport measurements for YRh 6Ge 4 being a triply degenerate nodal semimetal

Abstract

We have investigated magnetotransport properties of YRh 6Ge 4, 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 YRh 6Ge 4 is much closer to the Fermi level than previously demonstrated triply degenerate nodal semimetals such as MoP and WC. These results suggest YRh 6Ge 4 may serve as a model system to probe exotic properties of three-component fermions and understand their underlying physics.

Authors:
ORCiD logo; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Univ. of Arkansas, Fayetteville, AR (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1593552
Grant/Contract Number:  
SC0019467
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 3; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhu, Yanglin, Gui, Xin, Wang, Yu, Graf, David, Xie, Weiwei, Hu, Jin, and Mao, Zhiqiang. Evidence from transport measurements for YRh6Ge4 being a triply degenerate nodal semimetal. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.035133.
Zhu, Yanglin, Gui, Xin, Wang, Yu, Graf, David, Xie, Weiwei, Hu, Jin, & Mao, Zhiqiang. Evidence from transport measurements for YRh6Ge4 being a triply degenerate nodal semimetal. United States. doi:10.1103/PhysRevB.101.035133.
Zhu, Yanglin, Gui, Xin, Wang, Yu, Graf, David, Xie, Weiwei, Hu, Jin, and Mao, Zhiqiang. Wed . "Evidence from transport measurements for YRh6Ge4 being a triply degenerate nodal semimetal". United States. doi:10.1103/PhysRevB.101.035133.
@article{osti_1593552,
title = {Evidence from transport measurements for YRh6Ge4 being a triply degenerate nodal semimetal},
author = {Zhu, Yanglin and Gui, Xin and Wang, Yu and Graf, David and Xie, Weiwei and Hu, Jin and Mao, Zhiqiang},
abstractNote = {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.},
doi = {10.1103/PhysRevB.101.035133},
journal = {Physical Review B},
number = 3,
volume = 101,
place = {United States},
year = {2020},
month = {1}
}

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