Fermi- to non-Fermi-liquid crossover and Kondo behavior in two-dimensional (Cu2/3V1/3)V2S4

A Gauzzi; H Moutaabbid; Y Klein; G Loupias; V Hardy

doi:10.1088/1361-648X/ab1d9b

Fermi- to non-Fermi-liquid crossover and Kondo behavior in two-dimensional (Cu_2/3V_1/3)V₂S₄

J Phys Condens Matter. 2019 Aug 7;31(31):31LT01. doi: 10.1088/1361-648X/ab1d9b. Epub 2019 Apr 29.

Authors

A Gauzzi¹, H Moutaabbid, Y Klein, G Loupias, V Hardy

Affiliation

¹ Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC) UMR7590, Sorbonne Université/CNRS/Museum National d'Histoire Naturelle, 4 place Jussieu, 75005 Paris, France.

PMID: 31035261
DOI: 10.1088/1361-648X/ab1d9b

Abstract

By means of a specific heat (C) and electrical resistivity ([Formula: see text]) study, we give evidence of a pronounced Fermi liquid (FL) behavior with sizable mass renormalization, [Formula: see text], up to unusually high temperatures ∼70 K in the layered system (Cu_2/3V_1/3)V₂S₄. At low temperature, a marked upturn of both C and [Formula: see text] 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.