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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 isunderstood as partial delocalized eg electron orbitals in the Jahn-Tellerdistortion of the pyramids dimmer with strong hybridized Mn3+-O bonds. Ourlocal probes, Raman, infrared, and X-ray absorption, back the conclusion bywhich there is no structural phase transition at TN\simTC. Ferroelectricity ismagnetically assisted by electron localization triggering latticepolarizability by unscreening. We have also found phonon hardening as the rareearth is sequentially replaced. This is understood as consequence of lanthanidecontraction. It is suggested that partially f-electron screened Rare Earthnuclei might be introducing a perturbation to eg electrons prone to delocalizeas the superexchange interaction takes place.

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