Abstract
Abstract Photoemission experiments on mixed valent Yb-Al compounds prepared by diffusing Yb into an Al(110) single crystal are reported. At high Yb concentrations surface core level peaks reveal a purely divalent surface in agreement with recent results for single crystal YbAl2. In the dilute limit, when the intensity from bulk Yb is reduced below the limit of detection, a surface layer of divalent Yb still persists and a surface segregation of Yb in Al is made evident. When the bulk concentration of Yb is reduced the bulk mean valence increases. For diluted samples, when the formation of YbAl3 in a surrounding of elemental Al is expected, Yb is still in a mixed valent state. The highly resolved structures from trivalent Yb are compared with a recent calculation of the 4f13 → 4f12 multiplet pattern.
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