Investigation of Transport Mechanism Through Charge-Active Regions in Sm _0.5Ca _0.5MnO ₃

Polycrystalline system of Sm0.5Ca0.5MnO3 has been synthesized through standard solid state reactions method. Phase purity and structural analysis have been investigated by refinement of XRD pattern using FullProf code that displayed perovskite orthorhombic structure of space group Pbnm. A low fields magnetic study reveals two prominent peaks, one at TCO~ 270 K and other at TC ~110 K. A broad investigation on conduction phenomena has been made by employing impedance spectroscopy in frequency range 1-10 MHz and temperature ranging 78 K - 300 K. A careful study has been carried out of the system for hopping process of charge carriers through charge active regions of grain and grains boundaries with temperature and frequency degree of freedom. Contrary to the typical investigation of Arrhenius behavior, the conduction of the system has been analyzed using Small Polaron Hopping (SPH) and Variable Range Hopping (VRH) models. This effort may present a detail and systematic addition to understanding the charge transport in divalent doped rare earth manganites.