Lack of Jahn-Teller distortion in highly diluted LaMn{sub 1-x}Ga{sub x}O{sub 3} (x>0.6)
- Instituto de Ciencia de Materiales de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza (Spain)
We have investigated the local structure around the Mn atom on highly diluted manganites with formal Mn{sup 3+} and Mn{sup 3.5+} ions by x-ray absorption fluorescence spectra. Both x-ray absorption near-edge structure and extended x-ray absorption fine structure were recorded for LaMn{sub 1-x}Ga{sub x}O{sub 3} (x=0.8 and 0.9) and La{sub 0.9}Ca{sub 0.1}Mn{sub 0.2}Sc{sub 0.8}O{sub 3} 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 Mn{sup 3+} ion. This result suggests that the ordered tetragonal distortions in LaMnO{sub 3} are not originated by a single ion mechanism like the Jahn-Teller one.
- OSTI ID:
- 20787960
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 9; Other Information: DOI: 10.1103/PhysRevB.73.094416; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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