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, , up to unusually high temperatures ∼70 K in the layered system (Cu2/3V1/3)V2S4. 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 VS2 layers and impurity spins of the V3+ 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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