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Type: Artigo de periódico
Title: Order-disorder in the Jahn-Teller transition of LaMnO3: A Raman scattering study
Author: Granado, E
Sanjurjo, JA
Rettori, C
Neumeier, JJ
Oseroff, SB
Abstract: The high-T "orthorhombic-cubic" Jahn-Teller (JT) transition of a polycrystalline sample of LaMnO3 is studied by Raman scattering. A CaMnO3 ceramic sample is used as a reference compound. Dramatic braodening of the LaMnO3 Raman modes are observed as T approaches the JT transition temperature (T-JT) from below. The strong T dependence of the phonon linewidth suggests that considerable lattice disorder is already present at temperatures well below T-JT. Our results indicate that the JT transition in LaMnO3 is of order-disorder type and is driven by thermally activated e(g) orbital disorder of the Mn3+ ion in the MnO6 octahedra.
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 62, n. 17, n. 11304, n. 11307, 2000.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.62.11304
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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