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Type: Artigo de evento
Title: Phonons In The Bilayered Magnetic Manganite La2-2xsr 1+2xmn2o7 (x = 0.30, 0.50)
Author: Martinho H.
Rettori C.
Huber D.L.
Mitchell J.F.
Oseroff S.B.
Abstract: We have studied the ab-plane Raman-active phonons of the bilayered magnetic manganite La2-2xSr1+2xMn2O 7 for x = 0.30 and 0.50. The Raman response was deconvoluted to seven modes in both cases and their symmetries and T-dependence analyzed. We found that the T-dependence of the linewidth and frequency of almost phonons follows the two-phonon anharmonic decay and the usual Grüneisen behavior, respectively, with exception of the 1000 cm-1 mode for x = 0.30 that softens ∼ 150 cm-1 below Tc due to their strong spin-phonon coupling. We also notice that some modes for x = 0.50 before associated to two- and three-phonons Raman process appeared to us as being one-phonon Raman peaks. © 2003 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2003.12.735
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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