Transition from Kondo to intermediate valence regime in : an ESR study

Abstract

We report on electron spin resonance (ESR) results for the series of compounds doped with Gd. We show that from the Gd g-value and linewidth one can determine the concentration where the system goes from Kondo single impurity to Kondo lattice (and intermediate valence) regimes. The observed behaviour in both the g-value and the slope of the linewidth-T curves is explained using the indirect interaction between Gd and Ce moments. The calculation leads to the determination of the Ce-Gd exchange parameter meV and the Ce-conduction electron exchange parameter meV, for x = 1.