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|Type:||Artigo de evento|
|Title:||Phonons In The Bilayered Magnetic Manganite La2-2xsr 1+2xmn2o7 (x = 0.30, 0.50)|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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