12-17 September 2010
CERN
Europe/Zurich timezone
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Perturbed Angular Correlations Investigations on Magneto-Electric Manganites
Presented by Tânia MELO MENDONçA
Type: POSTER
Track: Magnetism and Magnetic materials - Bulk and thin layers
Content
The perturbed angular correlation (PAC) technique was applied to study the rare-earth (R) local environment in a series of rare-earth manganites (RMnO3, R=Nd, Sm, Eu, Gd, Ho, Y, Er, Yb, and Lu). By measuring the electric field gradients (EFG) at the rare-earth site, the charge distribution of the R neighborhood was fully characterized. The EFG were studied as a function of the rare earth ionic radius (RI) and the results were interpreted with the help of ab-initio calculations using the density functional full potential augmented plane wave (FLAPW) method.The experimental and simulated results show two different EFG distributions for all compounds. Different local environments were observed depending in the crystalline structure (orthorhombic or hexagonal) being only one directly attributed to the rare-earth crystalline site. The existence of intrinsic nanoscale electronic inhomogeneities scenario associated to subtle distortions around the R-O polyhedra is discussed.
Sponsored accomodation
yes
Contribution
oral
Place
Primary authors
- Tânia MELO MENDONçA IFIMUP and IN – Institute of Nanosciences and Nanotechnology, Dep. De Física da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
Co-authors
- Dr. Armandina Maria LIMA LOPES Centro de Física Nuclear da Universidade de Lisboa, Av. Prof. Gama Pinto 2, 1649-002 Lisboa, Portugal
- Joao Nuno GONçALVES Departamento de Física and CICECO, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- Dr. Joao Guilherme CORREIA Instituto Tecnológico e Nuclear, E.N. 10, 2686-953 Sacavém, Portugal
- Dr. Pedro BANDEIRA TAVARES Centro de Química – Vila Real, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal
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