Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 44: Elektronische Struktur (Experiment und Theorie) III

O 44.5: Vortrag

Freitag, 12. März 2004, 12:15–12:30, H38

Resonant photoemission spectra and electronic structure of RT2 compounds (R = Ce, Pr, Nd; T = Co, Rh, Ir) — •Yuri Kucherenko, Serguei Molodtsov, and Clemens Laubschat — Institut für Festkörperphysik, TU Dresden, D-01062 Dresden

Resonant 4f photoemission spectra of RT2 Laves-phase compounds (R = Ce, Pr, Nd; T = Co, Rh, Ir) taken at the 4d → 4f excitation threshold are analysed in the framework of the single-impurity Anderson model. The theoretical simulation of the shape of the photoemission spectra is performed taking into account both surface and bulk contributions to the spectral intensity. For a given T element the hybridization strength is found to decrease in going from Ce to Nd as one would expect, but the decrease is fairly slow (by about 20%). For given R it increases in going from Co to Ir reflecting the spatial extension of the 3d, 4d and 5d orbitals. The observed trends are in good agreement with calculated df hybridization matrix elements and, consequently, df hybridization is governed by the spatial overlap of the respective orbitals.

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