Dielectric loss anomaly and polaron hopping conduction of Gd1/3Sr2/3FeO3

Abstract

In this study, the dielectric, magnetic, and transport properties of Gd0.33Sr0.67FeO3 have been analyzed. The temperature dependence of resistivity exhibits the adiabatic small polaron hopping conduction; i.e., ρ/T=A exp(E/kBT), E being the small polaron hopping energy. The dielectric loss anomaly was found to be around 170 K. The activation energy corresponding to the relaxation process of this dielectric anomaly was 0.16 eV. A dielectric relaxation process shows up with an activation energy nearly equal to that of dc conduction. The dielectric anomaly and resistivity of Gd0.33Sr0.67FeO3, which arises due to the presence of Fe4+ and Fe3+ ions, has been analyzed in the light of the small polaron hopping conduction mechanism.