Wave-vector dependent intensity variations of the Kondo peak in photoemission from CePd$_3$

TL;DR

This study investigates how the intensity of the Kondo peak in photoemission spectra of CePd$_3$ varies with wave-vector, revealing lattice periodicity effects and the influence of non-4f energy bands.

Contribution

It demonstrates the wave-vector dependence of the Kondo peak intensity and links it to electron hopping matrix elements within a simplified periodic Anderson model.

Findings

Intensity variations follow the lattice periodicity.

Maximum intensity occurs near Gamma points.

Wave-vector dependence explained by a simplified model.

Abstract

Strong angle-dependent intensity variations of the Fermi-level feature are observed in 4d - 4f resonant photoemission spectra of CePd$_3$(111), that reveal the periodicity of the lattice and largest intensity close to the Gamma points of the surface Brillouin zone. In the framework of a simplified periodic Anderson model the phenomena may quantitatively be described by a wave-vector dependence of the electron hopping matrix elements caused by Fermi-level crossings of non-4f-derived energy bands.