Fermi- to non-Fermi-liquid crossover and Kondo transition in two-dimensional Cu$_{2/3}$V$_{1/3}$V$_2$S$_4$
| Autor: | Gauzzi, A., Moutaabbid, H., Klein, Y., Loupias, G., Hardy, V. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 31 (2019) 31LT01 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1361-648X/ab1d9b |
| Popis: | By means of a specific heat ($C$) and electrical resistivity ($\varrho$) study, we give evidence of a pronounced Fermi liquid (FL) behavior with sizable mass renormalization, $m^{\ast}/m = 30$, up to unusually high temperatures $\sim$70 K in the layered system Cu$_{2/3}$V$_{1/3}$V$_2$S$_4$. At low temperature, a marked upturn of both $C$ and $\varrho$ 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. Comment: 6 pages, 5 figures |
| Databáze: | arXiv |
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