Two-particle spectra of heavy-fermion systems.

Abstract

Abstract Appearance potential spectra of heavy fermion systems are presented and analyzed in the frame of the Gunnarsson-Schonhammer approach for the Anderson-Impurity model. This procedure has been used successfully to describe a wide variety of one-particle spectroscopies of 4f systems. Here we present a generalization of the Gunnarsson-Schonhammmer approach for two-particle response functions, measured in appearance-potential spectroscopy. Calculations and experiments are presented for CeNi 5 and CePd 3 . It appears that the first term in the 1/N expansion already gives strikingly good agreement with the experimental data and the Gunnarsson-Schonhammer approach describes two-particle response functions as reliably as those of one-particle spectra.