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

Abstract

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.

6 pages, 6 figures

References in corpus (5)

• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Incoherent non-Fermi liquid scattering in a Kondo lattice
• Pressure Study of Quantum Criticality in CeCoIn5
• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5

Cited by in corpus (9)

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• The role of thermal disorder for magnetism and the $\alpha -\gamma$ transition in Cerium; Results from density-functional theory
• Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition
• Pairing symmetry of heavy fermion superconductivity in the two-dimensional Kondo-Heisenberg lattice model
• Unified description of resistivity and thermopower of Pr${}_2$Ir${}_2$O${}_7$: possible influence of crystal field excitation in a Kondo lattice
• Non-Fermi liquid regime in metallic pyrochlore iridates: Quantum Griffiths singularities
• Quantum criticality and superconducting pairing in Ce(1-x)Yb(x)CoIn5 alloys
• Zero-Field Quantum Critical Point in Ce${}_{0.91}$Yb${}_{0.09}$CoIn${}_5$
• Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5