Magnetic field induced absorption in Pb xEu1-xTe magnetic semiconductors

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.

Bibliographic Details

Main Authors:	Hanamoto,L. K., Henriques,A. B., Rappl,P. H. de Oliveira, Oliveira,N. F., Ueta,A. Y., Abramof,E.
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Física 2004
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332004000400044
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