Fe+3- Mn+4 and Ti+4- Mn+3 interactions effect on the structural, electronic, magnetic and magnetoelectronic properties of perovskite manganites

Abstract

In this study, we report room temperature positive magneto capacitance due to Ti +4 and Mn +3 valence states interactions in La 0.7 Pb 0.3 Mn 0.4 Ti 0.6 O 3+δ (δ = 0.15) i.e. La 0.66 Pb 0.3 Mn 0.4 Ti 0.56 O 3 and negative magneto capacitance due to Fe +3 and Mn +4 valance states interactions in Fe doped composition La 0.7 Pb 0.3 Mn 0.4 Fe 0.6 O 3. Rietveld analysis shows similar structural properties of Fe and Ti doped compositions. Synchrotron X-ray absorption spectroscopy (XAS) studies show (i) the presence of Ti +4 , Mn +3 and Mn +4 in La 0.66 Pb 0.3 Mn 0.4 Ti 0.56 O 3 and (ii) Fe +3 , Mn +3 and Mn +4 in La 0.7 Pb 0.3 Mn 0.4 Fe 0.6 O 3 . At room temperature, Fe doped composition shows nearly three times more magnetic moment in comparison to the magnetic moment of Ti doped composition. La 0.7 Pb 0.3 Mn 0.4 Fe 0.6 O 3 composition shows maximum ∼64% negative magneto capacitance while La 0.66 Pb 0.3 Mn 0.4 Ti 0.56 O 3 shows maximum ∼ 12% positive magneto capacitance. Size, quantity, number of d electrons and type of interactions among the valence states Fe +3 (0.645 Å), Ti +4 (0.605 Å), Mn +3 (0.645 Å), Mn +4 (0.53 Å) affect the electronic, magnetic and magnetoelectric properties of La 0.66 Pb 0.3 Mn 0.4 Ti 0.56 O 3 and La 0.7 Pb 0.3 Mn 0.4 Fe 0.6 O 3 manganites.