Article Magnetotransport properties and Shubnikov–de Haas oscillations in a type-II nodal-line semimetal candidate n -type Mg 3 Bi 2 single crystal

Yosuke Goto ORCID ; Masayuki Murata ORCID ; Hidetomo Usui ORCID ; Keigo Ono ORCID ; Joseph P. Heremans ORCID ; Taichi Terashima SAMURAI ORCID ; Chul-Ho Lee ORCID

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Yosuke Goto, Masayuki Murata, Hidetomo Usui, Keigo Ono, Joseph P. Heremans, Taichi Terashima, Chul-Ho Lee. Magnetotransport properties and Shubnikov–de Haas oscillations in a type-II nodal-line semimetal candidate n -type Mg 3 Bi 2 single crystal. Physical Review B. 2025, 111 (7), 075163. https://doi.org/10.1103/physrevb.111.075163

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(abstract)

Mg3Bi2 is a candidate Type-II nodal-line semimetal (a novel category of topological semimetals). However, the exotic transport properties of Mg3Bi2 single crystals are yet to be elucidated. Herein, we report the magnetotransport properties of an n-type Mg3Bi2 single crystal grown from a melt. The results revealed that the single crystal exhibited a very large nonsaturating magnetoresistance (5000%) under an 8 T field, significantly exceeding that of polycrystals. The combined analysis of Shubnikov–de Haas (SdH) oscillations, Hall resistivity, and first-principles calculations suggest that SdH oscillations originate from trivial electron bands rather than hole bands, which contain an almost linear dispersion. We confirmed that the electron mobility reached 10000 cm2/Vs by analyzing Hall resistivity and magnetoresistance based on a two-band model. The electron/hole concentration and mobility were used to investigate the measured transport properties, such as the Nernst coefficient. Overall, these results are critical for elucidating the electronic structure and transport properties of Mg3Bi2.

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Keyword: Mg3Bi2, Shubnikov–de Haas oscillation, magnetotransport

Date published: 2025-02-26

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 24699950) vol. 111 issue. 7 075163

Funding:

  • New Energy and Industrial Technology Development Organization JPNP14004
  • Japan Society for the Promotion of Science 23K17342
  • Japan Society for the Promotion of Science 20KK0124
  • Japan Society for the Promotion of Science JPMJMI19A1
  • U.S. Department of Energy DE-SC0020923
  • Ministry of Education, Culture, Sports, Science and Technology

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5347

First published URL: https://doi.org/10.1103/physrevb.111.075163

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Updated at: 2025-02-27 16:31:06 +0900

Published on MDR: 2025-02-27 16:31:06 +0900

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