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|Type:||Artigo de periódico|
|Title:||Order-disorder in the Jahn-Teller transition of LaMnO3: A Raman scattering study|
|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.|
|Editor:||Amer Physical Soc|
|Citation:||Physical Review B. Amer Physical Soc, v. 62, n. 17, n. 11304, n. 11307, 2000.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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