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The electronic structure of (Ce,Yb)CoIn5 has been studied by a combination ofphotoemission, x-ray absorption and bulk property measurements. Previousfindings of a Ce valence near 3+ for all x and of an Yb valence near 2.3+ forx>0.3 were confirmed. One new result of this study is that the Yb valence forx<0.2 increases rapidly with decreasing x from 2.3+ toward 3+, which correlateswell with de Haas van Alphen results showing a change of Fermi surface aroundx=0.2. Another new result is the direct observation by angle resolvedphotoemission Fermi surface maps of about 50% cross sectional area reductionsof the \alpha- and \beta-sheets for x=1 compared to x=0, and a smaller,essentially proportionate, size change of the \alpha-sheet for x=0.2. Thesechanges are found to be in good general agreement with expectations from simpleelectron counting. The implications of these results for the unusual robustnessof superconductivity and Kondo coherence with increasing x in this alloy systemare discussed.

Yb Valence Change in (Ce,Yb)CoIn5 from spectroscopy and bulk properties