Speaker
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)
Description
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.
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Primary author
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)
Dr
Celine Darie
(Institut Néel, CNRS, Av. des Martyrs 25, F-38042 Grenoble CEDEX 9, France)
Dr
Joao Guilherme Correia
(Instituto Tecnológico e Nuclear, E.N. 10, 2686-953 Sacavém, Portugal)
Joao Nuno Gonçalves
(Departamento de Física and CICECO, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal)
Dr
Joao Pedro Araujo
(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)
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)
Dr
Vitor Sequeira de Amaral
(Departamento de Física and CICECO, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal)
