[Zurück]

X. Wang, H. Michor, M. Grioni:
"Probing the nature of the Ce 4f states in CeX₉Si₄ (X=Ni,Co) by high-energy electron spectroscopies";
Physical Review B, 75 (2007), S. 035127-1 - 035127-5.

Probing the nature of the Ce 4f states in CeX₉Si₄ (X=Ni,Co) by high-energy electron spectroscopies

X. Wang, 1 H. Michor, 2 and M. Grioni 1
1 IPN, Ecole Polytechnique Fédéderale (EPFL), CH-1015 Lausanne, Switzerland
2 Institut für Festkörperphysik, TU Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria

We have used x-ray photoelectron spectroscopy, and resonant inverse photoemission at the CeM₅(3d_5/2-->4f) edge, to study the Ce 4f states in the isostructural metallic compounds CeCo₉Si₄ and CeNi₉Si₄. The spectroscopic data reveal the intermediate-valence nature of these materials. They also suggest that a larger density of states at the Fermi level, and a reduced 4f energy, are the origin of an enhanced 4f-conduction band hybridization in the Co compound. This provides an explanation for the remarkable differences in the magnetic, transport, and thermodynamic properties of the two materials.

http://dx.doi.org/10.1103/PhysRevB.75.035127