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We have investigated the structural, magnetic and dielectric properties ofPb-based langasite compound Pb$_3$TeMn$_3$P$_2$O$_{14}$ both experimentally andtheoretically in the light of metal-oxygen covalency, and the consequentgeneration of multiferroicity. It is known that large covalency between Pb 6$p$and O 2$p$ plays instrumental role behind stereochemical lone pair activity ofPb. The same happens here but a subtle structural phase transition above roomtemperature changes the degree of such lone pair activity and the systembecomes ferroelectric below 310 K. Interestingly, this structural change alsomodulates the charge densities on different constituent atoms and consequentlythe overall magnetic response of the system while maintaining globalparamagnetism behavior of the compound intact. This single origin of modulationin polarity and paramagnetism inherently connects both the functionalities andthe system exhibits mutiferroicity at room temperature.

Covalency driven modulation of paramagnetism and development of lone pair ferroelectricity in multiferroic Pb$_3$TeMn$_3$P$_2$O$_{14}$