J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988Proceedings of the International Conference on Magnetism
|Page(s)||C8-771 - C8-772|
J. Phys. Colloques 49 (1988) C8-771-C8-772
ELECTRONIC STRUCTURE OF CeCu6 AND LaCu6F. Marabelli1, P. Wachter1 et e. Walker2
1 Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
2 Département de Physique de la Matière Condensée, 1211 Geneva, Switzerland
We present the first optical reflectivity measurements on the a - c plane of a single crystal of the heavy fermion CeCu6 and on a polycrystalline sample of LaCu6. The measurements have been made between 12 eV and 1 meV at temperatures between 5 K and 300 K. Whereas the spectrum of LaCu6 does not change at low temperature, a strong difference is revealed in CeCu6 due to the interaction with the f states. In particular a new structure appears at very low energies which we ascribe to f-f transitions across a gap, however, the Fermi level lies in a narrow f-like band of high density of states.