Abstract
The effect of electron–phonon interaction on the temperature dependence of the electronicspectrum in thin ferromagnetic semiconducting films is studied using the s–d interactionmodel and a Green function formalism beyond the random phase approximation. Weobtain three temperature regions with different contributions of the damping termsdue to the s–d, electron–electron and electron–phonon interactions. The phononspectrum is discussed, too. Additional phonon damping and phonon frequency shiftarise when the electron–phonon interaction is properly included. The phononlinewidth may be obtained from the cubic terms of the anharmonic phonon–phononinteraction, while the calculation of the renormalized phonon frequency of theexperimentally obtained frequency shift required inclusion of the quartic term in theanharmonic interaction. The frequencies in thin ferromagnetic semiconducting filmsare smaller and the damping effects larger in comparison with the bulk case.
Published Version
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