Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)

We report on electronic collective excitations in RMn2O5 (R= Pr, Sm, Gd, Tb) showing condensation starting at and below TN\simTC\sim40-50 K. Its origin is understood as partial delocalized eg electron orbitals in the Jahn-Teller distortion of the pyramids dimmer with strong hybridized Mn3+-O bonds....

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Detalles Bibliográficos
Autores principales: Massa, Néstor Emilio, García Flores, Ali F., De Sousa Meneses, Domingos, Campo, Leire del, Echegut, Patrick, Fabbris, Gilberto, Martínez Lope, María Jesús, Alonso, José Antonio
Formato: Articulo
Lenguaje:Español
Publicado: 2012
Materias:
Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132116
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132116
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Química
spellingShingle Química
Massa, Néstor Emilio
García Flores, Ali F.
De Sousa Meneses, Domingos
Campo, Leire del
Echegut, Patrick
Fabbris, Gilberto
Martínez Lope, María Jesús
Alonso, José Antonio
Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
topic_facet Química
description We report on electronic collective excitations in RMn2O5 (R= Pr, Sm, Gd, Tb) showing condensation starting at and below TN\simTC\sim40-50 K. Its origin is understood as partial delocalized eg electron orbitals in the Jahn-Teller distortion of the pyramids dimmer with strong hybridized Mn3+-O bonds. Our local probes, Raman, infrared, and X-ray absorption, back the conclusion by which there is no structural phase transition at TN\simTC. Ferroelectricity is magnetically assisted by electron localization triggering lattice polarizability by unscreening. We have also found phonon hardening as the rare earth is sequentially replaced. This is understood as consequence of lanthanide contraction. It is suggested that partially f-electron screened Rare Earth nuclei might be introducing a perturbation to eg electrons prone to delocalize as the superexchange interaction takes place.
format Articulo
Articulo
author Massa, Néstor Emilio
García Flores, Ali F.
De Sousa Meneses, Domingos
Campo, Leire del
Echegut, Patrick
Fabbris, Gilberto
Martínez Lope, María Jesús
Alonso, José Antonio
author_facet Massa, Néstor Emilio
García Flores, Ali F.
De Sousa Meneses, Domingos
Campo, Leire del
Echegut, Patrick
Fabbris, Gilberto
Martínez Lope, María Jesús
Alonso, José Antonio
author_sort Massa, Néstor Emilio
title Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
title_short Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
title_full Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
title_fullStr Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
title_full_unstemmed Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
title_sort collective phase-like mode and the role of lattice distortions at tn~tc in rmn2o5 (r= pr, sm, gd, tb, bi)
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/132116
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