Valence band and core level XPS spectra have been measured for the amorphous CexRu100-x (x = 18, 58, 81), CexCu100-x (x = 14, 33, 50) and Ce66Si34 alloys produced by sputtering. The coupling constant between the 4f and conduction electron levels, Δ, and the number of 4f electrons, nf, are estimated from the Ce-3d core level spectra. The amorphous CexCu100-x (x = 14, 33, 50) and Ce66Si34 alloys are heavy fermion systems with small Δ, while the amorphous CexRu100-x (x = 18, 58, 81) alloys are intermediate valence systems with large Δ. We also derive the zero temperature magnetic susceptibility, χ(0), and Kondo temperature, Tκ, from these spectroscopic data and compare with those estimated from several low temperature physical properties.
ASJC Scopus subject areas
- Physics and Astronomy(all)