Fundamental Parameters and Mechanisms in the Ce Problem: Photoemission Results on CeAl2and CeAl2Alloys

Abstract

Photoelectron-spectroscopy studies of Ce${\mathrm{Al}}_2$, La${\mathrm{Al}}_2$, and the "chemically compressed" alloys ${\mathrm{Ce}}_{0.6}$ ${\mathrm{Y}}_{0.4}$ ${\mathrm{Al}}_2$ and ${\mathrm{Ce}}_{0.6}$ ${\mathrm{Sc}}_{0.4}$ ${\mathrm{Al}}_2$ were performed with use of synchrotron radiation. For all compounds the $4f$ binding energy is 2.55 ± 0.1 eV. These results, combined with previous bulk-property results, motivate a reevaluation of Anderson-model parameters and mechanisms as applied to Ce${\mathrm{Al}}_2$.