Fermi- to non-Fermi-liquid crossover and Kondo behavior in two-dimensional (Cu2/3V1/3)V2S4. (23rd May 2019)

• Record Type: Journal Article
• Authors: Gauzzi, A; Moutaabbid, H; Klein, Y; Loupias, G; Hardy, V
• Is Part Of: Journal of physics. Volume 31:Number 31(2019)
• Publication Date: 2019-05-23
• Subjects: Fermi liquids -- Kondo effect -- specific heat -- transport properties -- layered transition metal dichalcogenides; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab1d9b
• Languages: English
• ISSNs: 0953-8984

Abstract

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 (Cu2/3 V1/3 )V2 S4 . 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 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.