VP13-07 Analyzing Electrical Transport Phenomena in NdMn0.3Co0.7O3
Creators: Farooq Hussain Bhat
Jan Asifa and Ghazala Anjum
Publisher: name: IEEE
Year: 2025

The effect of Co doping on the conduction mechanism of polycrystalline NdMn0.3Co0.7O3 (NMCO7) sample, is studied by measuring the temperature-dependent dc resistivity ρ(T) in the temperature range of 150 K to 400 K. The temperature dependence of electrical resistivity indicates a typical semiconducting behaviour of NMCO7. Because of the interaction of various degrees of freedom exhibited by mixed valence manganites, the latter displays a complex transport mechanism described by multiple models like the bandgap model, SPH, and VRH. Some perovskites exhibit all three mechanisms in different temperature ranges [1-2]. To understand the mechanism behind the electrical transport properties in the NMCO7 sample, the electrical resistivity data as a function of temperature is fitted using models such as the Arrhenius law, small polaron hopping (SPH), Mott-variable range hopping (VRH), and Effros-Shklovskii (ES)-VRH. It is observed that in the high-temperature region, the data follows the Arrhenius law of activation and the SPH model, which account for electron-phonon interaction. In contrast, at lower temperatures, the VRH model and Mott-VRH yield better results. Hence, in the NMCO7 system, the charge transport properties are governed by a complex interplay among thermal activation, localized electronic states, and Coulomb interactions. Acknowledgements We are thankful to Dr. Dinesh K. Shukla , UGC –DAE CSR, Indore, India for the measurements done.References: References 1. A. Bhogra, A. Masarrat, R. Meena, et al. Scientific Reports 9 (2019) 14486. 2. J. P.Palakkal, P. N. Lekshmi, S. Thomas, M. Valant, K. G. Suresh and M. R. Varma, Mater. Res. Bull., 2016, 76, 161.
The effect of Co doping on the conduction mechanism of polycrystalline NdMn0.3Co0.7O3 (NMCO7) sample, is studied by measuring the temperature-dependent dc resistivity ρ(T) in the temperature range of 150 K to 400 K. The temperature dependence of electrical resistivity indicates a typical semiconducting behaviour of NMCO7. Because of the interaction of various degrees of freedom exhibited by mixed valence manganites, the latter displays a complex transport mechanism described by multiple models like the bandgap model, SPH, and VRH. Some perovskites exhibit all three mechanisms in different temperature ranges [1-2]. To understand the mechanism behind the electrical transport properties in the NMCO7 sample, the electrical resistivity data as a function of temperature is fitted using models such as the Arrhenius law, small polaron hopping (SPH), Mott-variable range hopping (VRH), and Effros-Shklovskii (ES)-VRH. It is observed that in the high-temperature region, the data follows the Arrhenius law of activation and the SPH model, which account for electron-phonon interaction. In contrast, at lower temperatures, the VRH model and Mott-VRH yield better results. Hence, in the NMCO7 system, the charge transport properties are governed by a complex interplay among thermal activation, localized electronic states, and Coulomb interactions. Acknowledgements We are thankful to Dr. Dinesh K. Shukla , UGC –DAE CSR, Indore, India for the measurements done.References: References 1. A. Bhogra, A. Masarrat, R. Meena, et al. Scientific Reports 9 (2019) 14486. 2. J. P.Palakkal, P. N. Lekshmi, S. Thomas, M. Valant, K. G. Suresh and M. R. Varma, Mater. Res. Bull., 2016, 76, 161.