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A detailed investigation of the electronic - and magneto - transportproperties of Nd0.8Sr0.2MnO3 with the variation of grain size (down to 42 nm)is presented here. Interestingly, we observe that the ferromagnetic insulatingstate is suppressed and a metallic state is stabilized as the grain size of thesample is reduced. As a result, metal insulator transition is observed in thislow doped manganite which is insulating in nature in its bulk form.Destabilization of polaronic order in the ferromagnetic insulating state due toenhanced surface disorder on grain size reduction has been attributed to thiseffect. A phenomenological model has been proposed to represent the concept ofdestabilization of polaron formation in the surface region of the nano grains.Resistivity and magnetoresistance data have been carefully analyzed employingdifferent suitable models. Electrical third harmonic resistance has beenmeasured to directly probe the electrical nonlinearity in the samples.

Transition from a ferromagnetic insulating to a ferromagnetic metallic  state in nanoparticles of Nd0.8Sr0.2MnO3 : Study of the electronic - and  magneto - transport properties