| Reference : Dynamic and structural properties of orthorhombic rare-earth manganites under high pr... |
| Scientific journals : Article | |||
| Physical, chemical, mathematical & earth Sciences : Physics | |||
| http://hdl.handle.net/10993/21322 | |||
| Dynamic and structural properties of orthorhombic rare-earth manganites under high pressure | |
| English | |
| Mota, D. A. [Universidade do Porto, Portugal > Instituto de Fisica dos Materiais da Universidade do Porto and Institute of Nanoscience and Nanotechnology, Departamento de Fisica e Astronomia da Faculdade de Ciencias] | |
| Almeida, A. [Universidade do Porto, Portugal > Instituto de Fisica dos Materiais da Universidade do Porto and Institute of Nanoscience and Nanotechnology, Departamento de Fisica e Astronomia da Faculdade de Ciencias] | |
| Rodrigues, V. H. [Universidade de Coimbra, Portugal > Centro de Estudos de Materiais por Difracao de Raios X, Departamento de Fısica, Faculdade de Ciencias e Tecnologia] | |
| Costa, M. M. R. [Universidade de Coimbra, Portugal > Centro de Estudos de Materiais por Difracao de Raios X, Departamento de Fısica, Faculdade de Ciencias e Tecnologia] | |
| Tavares, P. [Universidade de Tras-os-Montes e Alto Douro, Vila Real, Portugal > Centro de Quımica—Vila Real, Departamento de Quımica] | |
| Bouvier, P. [Centre National de la Recherche Scientifique, Université Grenoble-Alpes, France > Laboratoire des Matériaux et du Génie Physique] | |
| Guennou, M. [Centre de Recherche Publique Gabriel Lippmann, Belvaux, Luxembourg > Département Science et Analyse des Matériaux] | |
Kreisel, Jens  [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit > ; Centre de Recherche Publique Gabriel Lippmann, Belvaux, Luxembourg > Département Science et Analyse des Matériaux] | |
| Agostinho Moreira, J. [Universidade do Porto, Portugal > Instituto de Fisica dos Materiais da Universidade do Porto and Institute of Nanoscience and Nanotechnology, Departamento de Fisica e Astronomia da Faculdade de Ciencias] | |
| 2014 | |
| Physical Review. B | |
| 90 | |
| 5 | |
| Yes (verified by ORBilu) | |
| International | |
| 1098-0121 | |
| [en] We report a high-pressure study of orthorhombic rare-earth manganites AMnO3 using Raman scattering (for
A = Pr, Nd, Sm, Eu, Tb, and Dy) and synchrotron x-ray diffraction (XRD), for A = Pr, Sm, Eu, and Dy. In all cases, a phase transition was evidenced by the disappearance of the Raman signal at a critical pressure that depends on the A cation. For the compounds with A = Pr, Sm, and Dy, XRD confirms the presence of a corresponding structural transition to a noncubic phase, so that the disappearance of the Raman spectrum can be interpreted as an insulator-to-metal transition. We analyze the compression mechanisms at work in the different manganites via the pressure dependence of the lattice parameters, the shear strain in the ac plane, and the Raman bands associated with out-of-phase MnO6 rotations and in-plane O2 symmetric stretching modes. Our data show a crossover across the rare-earth series between two different kinds of behavior. For the smaller A cations considered in this study (Dy and Tb), the compression is nearly isotropic in the ac plane, with only small evolutions of the tilt angles and cooperative Jahn-Teller distortion. As the radius of the A cation increases, the pressure-induced reduction of Jahn-Teller distortion becomes more pronounced and increasingly significant as a compression mechanism, while the pressure-induced tilting of octahedra chains becomes conversely less pronounced. We finally discuss our results in light of the notion of chemical pressure and show that the analogy with hydrostatic pressure works quite well for manganites with the smaller A cations considered in this paper but can be misleading with large A cations. | |
| http://hdl.handle.net/10993/21322 | |
| 10.1103/PhysRevB.90.054104 | |
| Times Cited: 1 1
Journal Article |
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