Wave-vector dependence of 4f hybridization in Ce and Yb compounds
as reflected in angle-resolved photoemission spectra

Clemens Laubschat

Institute of Solid State Physics, TU Dresden, 01062 Dresden, Germany

C. Laubschat(1), S. Danzenbächer(1), S.L. Molodtsov(1), D. Vyalikh(1), Yu. Kucherenko(2), and C. Geibel(3) 1) Inst. f. Festkörperphysik, TU Dresden, D-01062 Dresden, Germany 2) Inst. of Metal Physics, National Academy of Science of Ukraine, UA-03142 Kiev, Ukraine 3) Max-Planck Inst. f. chem. Physik fester Stoffe, D-01187 Dresden, Germany 4f hybridization in rare-earth compounds leads to interesting many-body phenomena ranging from mixed-valence to heavy-Fermion behavior and in some cases even to a break-down of the Fermi-liquid picture. In electron spectroscopies these phenomena are reflected by the appearance of different final-state configurations. Angle-resolved photoemission spectra reveal wave-vector dependent splittings and intensity variations of these features with respect to each other, that point to a wave-vector dependence of hybridization. The phenomena may be described quantitatively in the framework of the periodic Anderson model (PAM) in the limit Uff®¥ that predicts large hybridization at those points in k-space where valence-band states approach the Fermi energy.