Local probe studies in the weakly Jahn- Teller distorted LaMnO3.08 manganite

resumo

The LaMnO3.08 manganite system was studied as a function of temperature ranging from 10 up to 292K using the perturbed angular correlation local probe technique at ISOLDE-CERN facility. The electrical field gradient (EFG) measurements performed across the different temperatures revealed a single EFG distribution, corresponding to a unique probe local environment. In contrast with the small-polaron picture, no fully Jahn-Teller distorted Mn3+O6 octahedra was observed in this insulator sample. A local single-phase scenario with uniform Mn charge distribution is proposed. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

palavras-chave

OXYGEN-CONTENT; LAMNO3+DELTA; PEROVSKITE; LA1-XCAXMNO3; LOCALIZATION; LA1-XSRXMNO3; DIFFRACTION; CATALYSTS; ORDER; NMR

categoria

Physics

autores

Lopes, AML; Correia, JG; Amaral, VS; Araujo, JP

nossos autores

agradecimentos

This work was supported by FCT-Portugal with projects PTDC/FIS/105416/2008, and CERN/FP/123585/2011; the ISOLDE collaboration with approved project IS487, the European Union FP7-through ENSAR, Contract No. 262010, and the BMBF German research program under contracts 05KK7TS2 and 05K10TS2.

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