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We use hard x-ray photoemission spectroscopy (HAXPES) to investigate theelectronic structure of YbAl2, for which the Yb valence has not beenconsistently reported to date. The bulk sensitivity and the analyticalsimplicity provided by the Yb 3d core-level HAXPES allow a reliabledetermination of the mean valence of Yb ions. For YbAl2, it is evaluated to be+2.20, which remains nearly unchanged below 300 K. The Kondo resonance peakwith an extremely high Kondo temperature (above 2000 K) is clearly identifiedin the valence-band spectra. The results indicate that a coherent Kondo statecan be robust even in a nearly divalent system.

Photoemission Evidence for Valence Fluctuations and Kondo Resonance in YbAl2