Investigation of transport mechanism through charge-active regions in Sm0.5Ca0.5MnO3

• Published in: Journal of magnetism and magnetic materials Vol. 564; p. 170160
• Main Authors: Shah, Matiullah, Idrees, M., Nadeem, M., Ghazanfar, Uzma, Atif, M., Alam, Fakhr e, Asadullah, Sultan Irshad, M., Abbasi, M.M., Bukhari, F., Rizwan, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-12-2022
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.170160

•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 conduction through charge active regions of grain and grains boundaries with temperature and frequency degree of freedom.•Contrary to the typical investigation of Arrhenius behaviour, the conduction processes of the charge carriers in the system has been investigated using conduction models of Small Polaron Hopping (SPH) and Variable Range Hopping (VRH) models in a wide range of temperature and applied frequency.
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.