Vanishing of Electron-Hole Asymmetry in Nano-Sized Charge Ordered Manganites Pr(1-x)Ca(x)MnO3 (x=0.36, 0.64)- EPR Studies

We observe a disappearance of electron-hole asymmetry in hole and electron doped manganites of composition Pr(1-x)Ca(x)MnO3 (x=0.36, 0.64), as reflected in the g-parameter values. The bulk property of opposite g-shifts in room temperature seems to have disappeared in nanoparticles. We analyze the results in the light of ferromagnetic fluctuations and melting of charge order in nanoparticles.