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<p>We present a comprehensive investigation into the structural, magnetic, and electrical properties of polycrystalline Nd<sub>0.67</sub>Sr<sub>0.16</sub>Ca<sub>0.17</sub>Mn<sub>0.75</sub>Fe<sub>0.25</sub>O<sub>3</sub> (NSCMFO). The NSCMFO perovskite manganite was synthesized using a conventional high-temperature solid-state reaction. X-ray diffraction (XRD) revealed an orthorhombic crystal structure with Pbnm symmetry, and Rietveld refinement was employed to determine precise structural parameters. Magnetic measurements, conducted between 0 and 300 K under a 0.05 T magnetic field, showed the simultaneous presence of antiferromagnetic (AFM) and ferromagnetic (FM) order at Néel temperature (T<sub>N</sub>) of 43 K, as evidenced by temperature-dependent magnetization curves in field-cooled (FC) and zero-field-cooled (ZFC) modes in addition to a charge ordering transition (T<sub>CO</sub>) observed at 397 K. Electrical resistivity measurements from 100 to 300 K demonstrated semiconducting behavior across the investigated temperature range. The persistent semiconductivity at the 25% Fe<sup>3+</sup> doping level is attributed to a reduced number of available hopping sites for Mn e<sub>g</sub>(↑) electrons, a consequence of Mn<sup>3+</sup> substitution by Fe<sup>3+</sup> which weakens the double exchange (DE) interaction. Analysis of the resistivity data suggests that electrical transport is governed by a combination of adiabatic small polaron hopping (SPH) and variable range hopping (VRH) mechanisms, with the VRH model being the dominant conduction mechanism.</p>

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Study of structural, magnetic and electrical properties of the rare-earth manganite Nd0.67Sr0.16Ca0.17Mn0.75Fe0.25O3

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Zaineb Mohamed,
  • Anissa Somrani,
  • Kholoud Abohelal,
  • J. Dhahri

摘要

We present a comprehensive investigation into the structural, magnetic, and electrical properties of polycrystalline Nd0.67Sr0.16Ca0.17Mn0.75Fe0.25O3 (NSCMFO). The NSCMFO perovskite manganite was synthesized using a conventional high-temperature solid-state reaction. X-ray diffraction (XRD) revealed an orthorhombic crystal structure with Pbnm symmetry, and Rietveld refinement was employed to determine precise structural parameters. Magnetic measurements, conducted between 0 and 300 K under a 0.05 T magnetic field, showed the simultaneous presence of antiferromagnetic (AFM) and ferromagnetic (FM) order at Néel temperature (TN) of 43 K, as evidenced by temperature-dependent magnetization curves in field-cooled (FC) and zero-field-cooled (ZFC) modes in addition to a charge ordering transition (TCO) observed at 397 K. Electrical resistivity measurements from 100 to 300 K demonstrated semiconducting behavior across the investigated temperature range. The persistent semiconductivity at the 25% Fe3+ doping level is attributed to a reduced number of available hopping sites for Mn eg(↑) electrons, a consequence of Mn3+ substitution by Fe3+ which weakens the double exchange (DE) interaction. Analysis of the resistivity data suggests that electrical transport is governed by a combination of adiabatic small polaron hopping (SPH) and variable range hopping (VRH) mechanisms, with the VRH model being the dominant conduction mechanism.