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<p>In this study, we investigate the effect of sodium doping on the electrical properties of Pr<sub>0.55</sub>Sr<sub>0.45–x</sub>Na<sub>x</sub>MnO<sub>3</sub> manganites (x = 0, 0.05, 0.1). X–ray diffraction analysis revealed that all samples crystallize in an orthorhombic structure with the <i>Pbnm</i> space group. The temperature dependence of resistivity displays a metal–insulator transition with increasing temperature at T<sub>ρ</sub>. With increasing sodium content, T<sub>ρ</sub> decreases due to an enhancement in Mn<sup>4+</sup> concentration. A large difference (more than 100&#xa0;K) was observed between electrical and magnetic transition temperatures. The electrical conduction mechanism is governed by the small polaron hopping model in the insulator phase and by single magnon scattering process in the metallic region. Electrical resistivity was theoretically investigated by using a phenomenological percolation model. The obtained results highlight the reliability of this model in describing the correlation between magnetic and electrical properties of Pr<sub>0.55</sub>Sr<sub>0.45–x</sub>Na<sub>x</sub>MnO<sub>3</sub> manganites, which exhibit both structural disorder and magnetic inhomogeneity near the magnetic transition temperature.</p>

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Correlation between magnetic and electrical properties of Pr0.55Sr0.45–xNaxMnO3 manganites based on percolation theory

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Wadii Mabrouki,
  • Akram Krichene,
  • Wahiba Boujelben

摘要

In this study, we investigate the effect of sodium doping on the electrical properties of Pr0.55Sr0.45–xNaxMnO3 manganites (x = 0, 0.05, 0.1). X–ray diffraction analysis revealed that all samples crystallize in an orthorhombic structure with the Pbnm space group. The temperature dependence of resistivity displays a metal–insulator transition with increasing temperature at Tρ. With increasing sodium content, Tρ decreases due to an enhancement in Mn4+ concentration. A large difference (more than 100 K) was observed between electrical and magnetic transition temperatures. The electrical conduction mechanism is governed by the small polaron hopping model in the insulator phase and by single magnon scattering process in the metallic region. Electrical resistivity was theoretically investigated by using a phenomenological percolation model. The obtained results highlight the reliability of this model in describing the correlation between magnetic and electrical properties of Pr0.55Sr0.45–xNaxMnO3 manganites, which exhibit both structural disorder and magnetic inhomogeneity near the magnetic transition temperature.