Interpretation of resonant photoemission spectra and electronic structure ofRT2compounds(R=Ce,Pr,Nd;T=Co,Rh,Ir)

Abstract

Resonant $4f$ photoemission spectra of $R{T}_{2}$ Laves-phase compounds $(R=\mathrm{Ce},\mathrm{Pr},\mathrm{Nd};T=\mathrm{Co},\mathrm{Rh},\mathrm{Ir})$ published in the literature [G. Kalkowski et al., Solid State Commun. 55, 977 (1985); J.-S. Kang et al., Phys. Rev. B 46, 15689 (1992)] are analyzed in the framework of the single-impurity Anderson model. For a given $T$ element the hybridization strength is found to decrease by about $20%$ in going from $\mathrm{Ce}$ to $\mathrm{Nd}$. For given $R$ it increases in going from $\mathrm{Co}$ to $\mathrm{Ir}$. The observed trends are in good agreement with calculated hybridization matrix elements.