Abstract
We have studied annealed CuYb thin films with ultraviolet photoemission spectroscopy. Anneals at successively higher temperatures result in the Yb valence changing from ∼3 to ∼2.2 where the spectrum is similar to that of YbCu 2. Divalent Yb is always present on the surface. Within the limits of our experimental resolution we do not observe any features that can be attributed to a “Kondo” resonance. The 4ƒ 13( 2F 7 2 ) peak does not extend to the Fermi level. We discuss the general problem of interpreting photoemission spectra from homogeneously mixed valent materials.
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