From local moment to mixed-valence regime in Ce1-xYbxCoIn5 alloys

Article

关键词: QUANTUM CRITICAL-POINT;    HIDDEN-ORDER;    SUPERCONDUCTIVITY;    MAGNETORESISTANCE;    CRITICALITY;    URU2SI2;    CECOIN5;    PHASE;   

DOI  :  10.1103/PhysRevB.89.115106

来源: SCIE

【 摘 要 】

We investigated the onset of the many-body coherence in the f-orbital single crystalline alloys Ce1-xYbxCoIn5 (0 <= x <= 0.775) through thermodynamic and magnetotransport 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 crossover from the predominantly localized Ce moment regime to the predominantly itinerant Yb f-electronic states regime for about 60% 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, Yb f electrons strongly interact with the conduction electrons while the Ce moments remain completely decoupled. The sublinear temperature dependence of resistivity across the whole range of Yb concentrations suggest the presence of a unconventional scattering mechanism for the conduction electrons.

【 授权许可】

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