Abstract
The electronic structure of CeYbCoIn has been studied by a combination of photoemission, x-ray absorption, and bulk property measurements. Previous findings of a Ce valence near 3 for all and of an Yb valence near 2.3 for were confirmed. One new result of this study is that the Yb valence for increases rapidly with decreasing from 2.3 toward 3+, which correlates well with de Haas van Alphen results showing a change of Fermi surface around . Another new result is the direct observation by angle resolved photoemission Fermi surface maps of 50 cross-sectional area reductions of the and sheets for compared to , and a smaller, essentially proportionate, size change of the sheet for . These changes are found to be in good general agreement with expectations from simple electron counting. The implications of these results for the unusual robustness of superconductivity and Kondo coherence with increasing in this alloy system are discussed.
1 More- Received 21 March 2013
DOI:https://doi.org/10.1103/PhysRevB.88.165118
©2013 American Physical Society