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Observation of quantum oscillations, linear magnetoresistance, and crystalline electric field effect in quasi-two-dimensional PrAgBi2
Abstract
We report the magnetic and magnetotransport properties with electronic band-structure calculation of the Bi square net system PrAgBi2. The magnetization and heat capacity data confirm the presence of a crystalline electric field (CEF) effect in PrAgBi2. Analysis of the CEF effect using a multilevel energy scheme reveals that the ground state of PrAgBi2 consists of five singlets and two doublets. The de Haas-van Alphen (dHvA) quantum oscillations data show a single frequency with a very small cyclotron effective mass of approximately 0.11 me. A nontrivial Berry phase is also observed from the quantum oscillations data. The magnetotransport data shows linear and unsaturated magnetoresistance, reaching up to 1060% at 2 K and 9 T. Notably, there is a crossover from a weak-field quadratic dependence to a high-field linear dependence in the field-dependent magnetoresistance data. The crossover critical field B∗ follows the quadratic temperature dependence, indicating the existence of Dirac fermions. The band-structure calculation shows several Dirac-like linear band dispersions near the Fermi level and a Dirac point close to the Fermi level, located at the Brillouin zone boundary. Ab initio calculations allowed us to ascribe the observed dHvA oscillation frequency to a particular feature of the Fermi surface. Our study suggests layered PrAgBi2 is a plausible candidate for hosting the CEF effect and Dirac fermion in the Bi square net.
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevB.111.045144
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- Copyright (2025 American Physical Society)
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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PHYSICAL REVIEW B
no. 111,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2025
- Bibliographic description:
- Malick S., Świątek H., Winiarski M., Klimczuk T.: Observation of quantum oscillations, linear magnetoresistance, and crystalline electric field effect in quasi-two-dimensional PrAgBi2// PHYSICAL REVIEW B -Vol. 111,iss. 4 (2025),
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.111.045144
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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