Transport and magnetic properties have been studied in two sets of sol-gel prepared Pr 1/2 Sr 1/2 MnO 3 nanoparticles having average particle size of 30 nm and 45 nm. Our measurements suggest that the formation of charge ordered state is largely affected due to lowering of particle size, but the ferromagnetic transition temperature (T C ) remains unaffected.
A gradual transformation from the polycrystalline to nanocrystalline and amorphous phase is studied by mechanical milling of bulk La 0.67 Ca 0.33 MnO 3 sample. The particle size is not monotonically decreasing with the increase of milling time. The grain growth kinetics appears at higher milling time, where the material shows the properties of amorphous ferromagnet.
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