Reference : Crossover in the pressure evolution of elementary distortions in RFeO3 perovskites an...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/40049
Crossover in the pressure evolution of elementary distortions in RFeO3 perovskites and its impact on their phase transition
English
Vilarinho, Rui [University of Porto > Physics and astronomy department]
Bouvier, Pierre [Centre National de la Recherche Scientifique - CNRS > > > ; Université Grenoble-Alpes]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Peral Alonso, Inmaculada [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Weber, Mads [ETH Zürich]
Tavares, P [Universidade de Trás-os-Montes e Alto Douro]
Mihalik, M []
Garbarino, Gaston []
Mezouar, Mohammed []
Kreisel, Jens mailto [University of Luxembourg > Rectorate > >]
Almeida, Abilio []
Moreira, Joachim Agostinho [University of Porto]
2019
Physical Review. B
American Physical Society
99
064109
Yes
International
2469-9950
2469-9969
[en] This work reports on the pressure dependence of the octahedral tilts and mean Fe-O bond lengths in RFeO3 (R = Nd, Sm, Eu, Gd, Tb, and Dy), determined through synchrotron x-ray diffraction and Raman scattering, and their role on the pressure-induced phase transition displayed by all of these compounds. For larger rare-earth cations (Nd-Sm), both anti- and in-phase octahedral tilting decrease as pressure increases, whereas the reverse behavior is observed for smaller ones (Gd-Dy). EuFeO3 stands at the borderline, with nearly pressure-independent tilt angles. For the compounds where the tilts increase with pressure, the FeO6 octahedra are compressed at lower rates than for those ones exhibiting opposite pressure tilt dependence. The crossover between the two opposite pressure behaviors is discussed in relation to the general rules proposed from different theoretical approaches. The similarity of the pressure-induced isostructural insulator-to-metal phase transition, observed in the whole series, points out that the tilts play a minor role in its driving mechanisms. A clear relationship between octahedral compressibility and critical pressure is ascertained.
Fonds National de la Recherche - FnR
Researchers
http://hdl.handle.net/10993/40049
10.1103/PhysRevB.99.064109
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.064109

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