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To study the nature of partially substituted Yb-ions in a Ce-based Kondolattice, we fabricated high quality Ce_{1-x}Yb_xCoIn_5 epitaxial thin filmsusing molecular beam epitaxy. We find that the Yb-substitution leads to alinear decrease of the unit cell volume, indicating that Yb-ions are divalentforming Kondo-holes in Ce_{1-x}Yb_xCoIn_5, and leads to a strong suppression ofthe superconductivity and Kondo coherence. These results, combined with themeasurements of Hall effect, indicate that Yb-ions act as nonmagnetic impurityscatters in the coherent Kondo lattice without serious suppression of theantiferromagnetic fluctuations. These are in stark contrast to previous studiesperformed using bulk single crystals, which claim the importance of valencefluctuations of Yb-ions. The present work also highlights the suitability ofepitaxial films in the study of the impurity effect on the Kondo lattice.

Strong suppression of superconductivity by divalent Ytterbium Kondo-holes in CeCoIn_5