期刊
PHYSICAL REVIEW B
卷 104, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L201103
关键词
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资金
- Investissement d'Avenir allowance from the Labex PALM [ANR-10-LABX-0039-PALM]
- ICAM - Gordon and Betty Moore Foundation's QuantEmX Program
- US-DOE, BES program [DE-SC0002613]
- National Science Foundation [NSF/DMR-1644779]
- State of Florida
- LNCMICNRS, a member of the European Magnetic Field Laboratory (EMFL)
- U.S. Department of Energy (DOE) [DE-SC0002613] Funding Source: U.S. Department of Energy (DOE)
The research focuses on the electronic topology in metallic kagome compounds, presenting transport experiments in Na2/3CoO2 which show evidence for the coexistence of light and heavy carriers. At low temperatures, the dominant light carrier conductivity is suppressed by B-linear MR, suggesting the presence of Dirac-like quasiparticles.
Electronic topology in metallic kagome compounds is under intense scrutiny. We present transport experiments in Na2/3CoO2 in which the Na order differentiates a Co kagome sublattice in the triangular CoO2 layers. Hall and magnetoresistance (MR) data under high fields give evidence for the coexistence of light and heavy carriers. At low temperatures, the dominant light carrier conductivity at zero field is suppressed by a B-linear MR, suggesting Dirac-like quasiparticles. Lifshitz transitions induced at large B and T unveil the lower mobility carriers. They display a negative B2 MR due to scattering from magnetic moments likely pertaining to a flat band. We emphasize an analogy with heavy fermion physics.
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