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Raman and infrared spectroscopies are used as local probes to study thedynamics of the Nd-O bonds in the weakly multiferroic NdMn2O5 system. Thetemperature dependence of selected Raman excitations reveals the splitting ofthe Nd-O bonds in NdMn2O5. The Nd3+ ion crystal field (CF) excitations inNdMn2O5 single crystals are studied by infrared transmission as a function oftemperature, in the 1800-8000 cm-1 range, and under an applied magnetic fieldup to 11 T. The frequencies of all 4Ij crystal-field levels of Nd3+ aredetermined. We find that the degeneracy of the ground-state Kramers doublet islifted ({\Delta}0 ~7.5 cm-1) due to the Nd3+-Mn3+ interaction in theferroelectric phase, below TC ~ 28 K. The Nd3+ magnetic moment mNd(T) and itscontribution to the magnetic susceptibility and the specific heat are evaluatedfrom {\Delta}0(T) indicating that the Nd3+ ions are involved in the magneticand the ferroelectric ordering observed below ~ 28 K. The Zeeman splitting ofthe excited crystal field levels of the Nd3+ ions at low temperature is alsoanalyzed.

Probing the role of Nd3+ ions in the weak multiferroic character of NdMn2O5 by optical spectroscopies