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Electronic topology in metallic kagome compounds is under intense scrutiny.We present transport experiments in Na2/3CoO2 in which the Na orderdifferentiates a Co kagome sub-lattice in the triangular CoO2 layers. Hall andmagnetoresistance (MR) data under high fields give evidence for the coexistenceof light and heavy carriers. At low temperatures, the dominant light carrierconductivity at zero field is suppressed by a B-linear MR suggesting Dirac likequasiparticles. Lifshitz transitions induced at large B and T unveil the lowermobility carriers. They display a negative B^2 MR due to scattering frommagnetic moments likely pertaining to a flat band. We underline an analogy withheavy Fermion physics.

Interplay between strong correlations and electronic topology in the underlying kagome lattice of Na2/3CoO2