| Issue |
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-699 - C8-700 | |
| DOI | https://doi.org/10.1051/jphyscol:19888316 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-699-C8-700
DOI: 10.1051/jphyscol:19888316
1 Instituto de Pesquisas Espaciais, av. dos Astronautas, 1758, 12.200 São Jose dos Campos, SP, Brazil
2 Centro Brasileiro de Pesquisas Fisicas - CBPF, Rua Dr. Xavier Sigaud, 150, 22290 Rio de Janeiro, RJ, Brazil
J. Phys. Colloques 49 (1988) C8-699-C8-700
DOI: 10.1051/jphyscol:19888316
QUASI PARTICLE ENERGY OF 4f-STATES IN THE RAMIREZ-FALICOV-KIMBALL (RFK) MODEL : MEMORY FUNCTION FORMALISM
I. C. da Cunha Lima1, C. E. Leal1, E. A. de Andrada e Silva1 et A. Troper21 Instituto de Pesquisas Espaciais, av. dos Astronautas, 1758, 12.200 São Jose dos Campos, SP, Brazil
2 Centro Brasileiro de Pesquisas Fisicas - CBPF, Rua Dr. Xavier Sigaud, 150, 22290 Rio de Janeiro, RJ, Brazil
Abstract
A new formalism is developed, based on the memory function approach, to treat many particle systems. The formalism is applied to the Ramirez-Falicov-Kimball (RFK) Hamiltonian, suitable to describe photoemission spectra in many light rare earth intermetallics. We obtain a quasi particle 4f-energy in the weak correlation regime and we discuss the bimodal structure of the f-f propagator in this regime comparing with the Hubbard-type structure in the strong correlation regime.