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 YbAl 2. 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 YbAl 3 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 4f 13 → 4f 12 multiplet pattern.
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