From local moment to mixed-valence regime in Ce(1-x)Yb(x)CoIn5 alloys

We investigated the onset of the many-body coherence in the f-orbital single crystalline alloys Ce(1-x)Yb(x)CoIn5 through thermodynamic and magneto-transport measurements. Our study shows the evolution of the many-body electronic state as the Kondo lattice of Ce moments is transformed into an array...

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Bibliographic Details
Published inarXiv.org
Main Authors Singh, Y P, Haney, D J, Huang, X Y, Lum, I K, White, B D, Dzero, M, Maple, M B, Almasan, C C
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.02.2014
Subjects
Conduction electrons
Crossovers
Electrical resistivity
Electron states
Electrons
Physics - Strongly Correlated Electrons
Residual resistivity
Temperature
Temperature dependence
Ytterbium
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Summary:We investigated the onset of the many-body coherence in the f-orbital single crystalline alloys Ce(1-x)Yb(x)CoIn5 through thermodynamic and magneto-transport measurements. Our study shows the evolution of the many-body electronic state as the Kondo lattice of Ce moments is transformed into an array of Ce impurities. Specifically, we observe a smooth crossover from the predominantly localized Ce moment regime to the predominantly itinerant Yb f-electronic states regime for about 50% of Yb doping. Our analysis of the residual resistivity data unveils the presence of correlations between Yb ions, while from our analysis of specific heat data we conclude that for 0.65<x<0.775, ytterbium f-electrons strongly interact with the conduction electrons while the Ce moments remain completely decoupled. The sub-linear temperature dependence of resistivity across the whole range of Yb concentrations suggest the presence of a nontrivial scattering mechanism for the conduction electrons.
ISSN:2331-8422
DOI:10.48550/arxiv.1401.1881