| Texto completo | |
| Autor(es): |
L. K. Hanamoto
;
A. B. Henriques
[2]
;
P. H. de Oliveira Rappl
[3]
;
N. F. Oliveira
[4]
;
A. Y. Ueta
[5]
;
E. Abramof
[6]
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Brazilian Journal of Physics; v. 34, p. 687-689, 2004-06-00. |
| Resumo | |
We report an investigation of the optical absorption spectrum, using non-polarized light, in Pb xEu1-xTe, x=0 and x=0.095, epitaxial thick layers grown by molecular beam epitaxy (MBE). The absorption edge is described by a broad band, due to the electronic transitions from the 4f7 of Eu2+ to the states in 4f6 5d configuration, as seen previously in bulk Eu chalcogenides. When a magnetic field is applied, a narrow absorption band (full width ~50 meV) emerges from the broad one. The energy of this absorption peak red shifts when the magnetic field increases, and reaches saturation when the Eu2+ attain ferromagnetic arrangement. This behaviour can be described by a localized excitation model with d - f exchange interaction. (AU) | |
| Processo FAPESP: | 02/00720-9 - Interações eletrônicas em compostos epitaxiais III-V e IV-VI |
| Beneficiário: | Luciana Kazumi Hanamoto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |