Fermi- to non-Fermi-liquid crossover and Kondo behavior in two-dimensional (Cu 2/3 V 1/3 )V 2 S 4

Abstract : By means of a specific heat (C) and electrical resistivity () study, we give evidence of a pronounced Fermi liquid (FL) behavior with sizable mass renormalization, m * /m = 30, up to unusually high temperatures ∼70 K in the layered system (Cu 2/3 V 1/3)V 2 S 4. At low temperature, a marked upturn of both C and is suppressed by magnetic field, which suggests a picture of Kondo coupling between conduction electrons in the VS 2 layers and impurity spins of the V 3+ ions located between layers. This picture opens the possibility of controlling electronic correlations and the FL to non-FL crossover in simple layered materials. For instance, we envisage that the coupling between layers provided by the impurity spins may realize a two-channel Kondo state.
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A. Gauzzi, H. Moutaabbid, Y. Klein, G. Loupias, Vincent Hardy. Fermi- to non-Fermi-liquid crossover and Kondo behavior in two-dimensional (Cu 2/3 V 1/3 )V 2 S 4. Journal of Physics: Condensed Matter, IOP Publishing, 2019, 31 (31), pp.31LT01. ⟨10.1088/1361-648X/ab1d9b⟩. ⟨hal-02161160⟩

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