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Type: Artigo de periódico
Title: Effects Of Cation Vacancies In The Phonon Raman Spectra Of Lamno3
Author: Granado E.
Sanjurjo J.A.
Rettori C.
Prado F.
Sanchez R.D.
Caneiro A.
Oseroff S.B.
Abstract: Raman spectra of La1-xMn1-xO3 (x = 0, 0.01, 0.017, 0.022, and 0.035) and La0.91-δMn1-δO3 polycrystalline samples, taken at T = 10 K and room temperature, are presented. All La1-xMn1-xO3 samples show at T = 10 K the presence of modes at about 480 and 610 cm-1, including the rhombohedral and quasi-cubic orthorhombic samples. However, the Raman spectrum of the rhombohedral La0.91-δMn1-δO3 sample does not show these modes at T = 10 K, but presents weak and broad structures at T = 295 K. These results are discussed in terms of local structural distortions associated with Mn vacancies and/or carrier localization in manganese perovskites.
Rights: fechado
Identifier DOI: 
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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