Y. Jeon

Ce-valence variations within the Anderson model framework

The Ce-valence and its thermal variation in the Ce1−xGdxAl3 and Ce(Cu1−xNix)2Si2 systems are measured via Ce-L3 X-ray absorption spectroscopy. The results are correlated with specific heat and structural data within the framework of the Anderson model.

X‐ray absorption spectroscopy studies of high‐Tc superconductors

X‐ray absorption spectroscopy measurements on rare‐earth (R) and Ba sites in the new superconducting oxides and in binary rare‐earth oxides are discussed. All of the near‐edge spectra appear to manifest a continuum resonance feature whose energy is quantitatively well correlated with the R–O and Ba–O bond lengths. Evidence supporting a second such feature related to the R/Ba interatomic distance is also presented. Finally, simultaneous consideration of both of these features appears consistent with the inverse square‐law expectation for the interatomic distance dependence of the energies of these spectra features.