Inconsistencies with the single impurity Undersign model in photoelectron spectra of cerium heavy fermion compounds
Abstract
We have re-examined the temperature-dependence of the valence band 4f features in Ce-based heavy fermions. We measured the phonon broadening of the Si-2p core levels in CeSi2 by determining the increase of the full width at half-maximum (FWHM) as a function of temperature. We discovered that all the temperature dependence is exactly accounted for, and there is none left over to attribute to any Kondo effects. We concluded that the feature of E sub F in Ce-based heavy fermions cannot be a Kondo resonance.
- Publication:
-
Presented at the 19th Rare Earth Research Conference
- Pub Date:
- 1991
- Bibcode:
- 1991rer..conf...14J
- Keywords:
-
- Cerium Compounds;
- Fermions;
- Phonons;
- Photoelectrons;
- Spectra;
- Temperature Dependence;
- Valence;
- Impurities;
- Models;
- Resonance;
- Atomic and Molecular Physics