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The fascinating phenomenon of destabilization of charge/orbital order inNd0.5Sr0.5MnO3 with the reduction of grain size is critically investigated.Based on our magnetic and transport experiments followed by a theoreticalanalysis, we analyze various possible mechanisms and try to delineate auniversal scenario behind this phenomenon. We, revisit this issue and discussthe overwhelming evidence from experiments on nano and bulk manganites as wellas the absence of correlation between size reduction and pressure effects onmanganites. We propose a phenomenological understanding on the basis ofenhanced surface disorder to explain the appearance of weak ferromagnetism andmetallicity in nanoparticles of Nd0.5Sr0.5MnO3. We also provide supportiveevidence from an ab-initio electron structure calculation and a recentnumerical simulation and argue that the mechanism is universal in all nanosizecharge ordered manganites.

On the question of metallicity and ferromagnetism in charge ordered insulating Nd0.5Sr0.5MnO3 nanoparticles