Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-04-16
Physics
Condensed Matter
Strongly Correlated Electrons
Journal of Physics Cond. Matter April 12, 2012. In press
Scientific paper
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.
Alonso Jose Antonio
Campo Leire del
Echegut Patrick
Fabbris Gilberto F. L.
García-Flores Ali F.
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