Bulk and surface valence in YbPd<SUB>x</SUB> compounds
- Domke, M.
- Laubschat, C.
- Sampathkumaran, E. V.
- Prietsch, M.
- Mandel, T.
- Kaindl, G.
- Middelmann, H. U.
DOIAbstract
The bulk and surface valence v− of Yb is investigated for YbPdx 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 Yb3Pd4 and YbPd3 are identified as bulk trivalent systems. The outermost atomic surface layer of both YbPd and Yb3Pd4 is found to be divalent, while only a fraction of Yb surface atoms turns divalent in YbPd3. The results are compared with bremsstrahlung isochromat spectroscopy measurements and predictions based on Miedema's scheme
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