Jahn-Teller distortion relaxation across the LaMnO3+Delta phase diagram

resumo

The evolution of the local Jahn-Teller distortion across the LaMnO3+Delta phase diagram was obtained using the perturbed angular correlation local probe technique. We found that upon doping, the local distortion decreases continuously with increasing doping and that no fully Jahn-Teller distorted Mn3+O6 octahedra are observed within the orthorhombic insulating phase. A local single-phase scenario is established for the orbital disordered orthorhombic crystallographic structure. We also show that the continuous weakening of the Jahn-Teller distortions is not limited to a single-phase environment and occurs in a similar manner within an undistorted rhombohedric matrix upon lowering the temperature.

palavras-chave

ORDER-DISORDER TRANSITION; OXYGEN-CONTENT; FUEL-CELLS; PEROVSKITE; CATALYSTS; LOCALIZATION; LA1-XSRXMNO3; TEMPERATURE; DIFFRACTION; DEFECTS

categoria

Physics

autores

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

nossos autores

agradecimentos

We thank Dr R Suryanarayanan from the LPCES-ICMMO, Universite Paris-Sud XI, Orsay, France, for the supply of the LaMnO3.12 sample. 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 by the BMBF German research program under contracts 05KK7TS2 and 05K10TS2. AMLL acknowledges financial support through FSE/POPH.

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