Abstract
The bulk and surface valence v¯ of Yb is investigated for intermetallic compounds (with x=1,1.33,3) by photoemission using synchrotron radiation. YbPd is found to be of intermediate valence (v¯≃2.75), while and are identified as bulk trivalent systems. The outermost atomic surface layer of both YbPd and is found to be divalent, while only a fraction of Yb surface atoms turns divalent in . The results are compared with bremsstrahlung isochromat spectroscopy measurements and predictions based on Miedema’s scheme.
- Received 15 July 1985
DOI:https://doi.org/10.1103/PhysRevB.32.8002
©1985 American Physical Society