ESR and Dielectric Studies on Superparamagnetic LaFeO3 Nanoparticles.

Superparamagnetic LaFeO3 nanoparticles are synthesized through sol gel method. Structural, magnetic and dielectric studies are carried out. Temperature dependent ESR studies show that the intensity of the ESR spectra increases at higher temperatures. The line shape at low temperature has inhomogeneous broadening and at higher temperature more symmetry is developed and it fits better with the Lorentzian. Resonance field decreases when temperature is lowered due to dipolar interactions and there are no extrema in linewidth are observed. Single semicircular arc in the Cole-Cole plot shows that the AC conductivity is from grains only. [ABSTRACT FROM AUTHOR]