%0 Journal Article
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%3 sharp.pdf
%X The optical absorption spectra in the region of the 4f(7) --> 4f(6)5d (t(2g)) transition energies of epitaxial layers of EuTe and Pb0.1Eu0.9Te, grown by molecular beam epitaxy, were studied using circularly polarized light, in the Faraday configuration. Under sigma(+) polarization a sharp symmetric absorption line (full width at half-maximum 0.041 eV) emerges on the low energy side of the band-edge absorption, for magnetic field intensities greater than 6 T. The absorption line shows a huge red shift (35 meV T-1) with increasing magnetic field. The peak position of the absorption line as a function of magnetic field is dominated by the d-f exchange interaction of the excited electron and the Eu2+ spins in the lattice. The d-f exchange interaction energy was estimated to be J(df)S = 0.15 +/- 0.01 eV. In Pb0.1Eu0.9Te the same absorption lime is detected, but it is broader, due to alloy disorder, indicating that the excitation is localized within a finite radius. From a comparison of the absorption spectra in EuTe and Pb0.1Eu0.9Te the characteristic radius of the excitation is estimated to be similar to10 Angstrom.
%8 Aug.
%N 30
%T Sharp lines in the absorption edge of EuTe and Pb0.1Eu0.9Te in high magnetic fields
%@secondarytype PRE PI
%K SENSORS AND MATERIALS, Optical absorption, Magnetic fields, Europium, Chalcogenides, Artiferromagnetic EuTE, Photoluminescence, Transitions, SENSORES E MATERIAIS, Absorção ótica, Campos magnéticos, Anti ferromagnético, Fotoluminescência, Transição.
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%@group LAS-INPE-MCT-BR
%@group LAS-INPE-MCT-BR
%@group LAS-INPE-MCT-BR
%@secondarykey INPE-11784-PRE/7143
%@copyholder SID/SCD
%@issn 0953-8984
%2 sid.inpe.br/marciana/2004/12.08.14.39.42
%@affiliation Universidade de São Paulo, Instituto de Física (USP)
%@affiliation Universidade de São Paulo, Instituto de Física (USP)
%@affiliation Universidade de São Paulo, Instituto de Física (USP)
%@affiliation Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais, (INPE. LAS)
%@affiliation Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais, (INPE. LAS)
%@affiliation Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais, (INPE. LAS)
%@project TECMAT: Tecnologia de materiais
%B Journal of Physics: Condensed Matter
%P 5597-5604
%4 sid.inpe.br/marciana/2004/12.08.14.39
%D 2004
%V 16
%A Hanamoto, L. K.,
%A Henriques, A. B.,
%A Oliveira Júnior, N. F.,
%A Rappl, Paulo,
%A Abramof, Eduardo.,
%A Ueta, Antonio Yukio,
%@dissemination WEBSCI
%@area FISMAT