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Título

Lack of Jahn-Teller distortion in highly diluted LaMn1–xGaxO3 (x>0.6)

AutorSánchez, María Concepción; García, Joaquín; Subías, G.; Blasco, Javier
Palabras claveLanthanum compounds
Calcium compounds
Jahn-Teller effect
EXAFS
XANES
X-ray fluorescence analysis
Fluorescence
Fecha de publicaciónmar-2006
EditorAmerican Physical Society
CitaciónPhysical Review - Section B - Condensed Matter 73(9): 094416.1-094416.5 (2006)
ResumenWe have investigated the local structure around the Mn atom on highly diluted manganites with formal Mn3+ and Mn3.5+ ions by x-ray absorption fluorescence spectra. Both x-ray absorption near-edge structure and extended x-ray absorption fine structure were recorded for LaMn1–xGaxO3 (x=0.8 and 0.9) and La0.9Ca0.1Mn0.2Sc0.8O3 compounds at room temperature. The local structure around the Mn atom in the gallium samples consist of a regular octahedron of oxygen atoms contrasting with the tetragonal Jahn-Teller distortion expected for a formal Mn3+ ion. This result suggests that the ordered tetragonal distortions in LaMnO3 are not originated by a single ion mechanism like the Jahn-Teller one.
Descripción5 pages, 4 figures, 1 table.-- PACS number(s): 61.10.Ht, 75.50.Dd, 75.50.Gg
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.73.094416
URIhttp://hdl.handle.net/10261/19462
DOI10.1103/PhysRevB.73.094416
ISSN1098-0121
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