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<p>Perovskite manganese oxides with ABX<sub>3</sub>-type crystal structures exhibit remarkable physical properties including metal–insulator transitions, colossal magnetoresistance, and significant temperature coefficient of resistance (TCR). In this study, polycrystalline La<sub>0.67</sub>Ca<sub>0.25</sub>Sr<sub>0.08</sub>MnO<sub>3</sub> ceramics were synthesized via solid-state reaction. Structural characterization through x-ray diffraction confirmed single-phase formation with orthorhombic symmetry (<i>Pnma</i> space group). Electrical transport measurements using a Physical Property Measurement System revealed a metal–insulator transition at 266.2&#xa0;K. Notably, the sample demonstrated substantial magnetoresistance (MR) across a broad temperature range, achieving 26% MR at room temperature under 5&#xa0;T magnetic field. Furthermore, a maximum TCR value of 2.3% K<sup>−1</sup> was observed near the phase transition temperature. These findings highlight the material's potential for dual-mode magnetic and temperature sensing applications in cryogenic environments.</p>

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Investigation of Magnetoresistance and Temperature Coefficient of Resistance in La0.67Ca0.25Sr0.08MnO3 Perovskite Manganite

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Minhua Ju,
  • Zhongwen Li

摘要

Perovskite manganese oxides with ABX3-type crystal structures exhibit remarkable physical properties including metal–insulator transitions, colossal magnetoresistance, and significant temperature coefficient of resistance (TCR). In this study, polycrystalline La0.67Ca0.25Sr0.08MnO3 ceramics were synthesized via solid-state reaction. Structural characterization through x-ray diffraction confirmed single-phase formation with orthorhombic symmetry (Pnma space group). Electrical transport measurements using a Physical Property Measurement System revealed a metal–insulator transition at 266.2 K. Notably, the sample demonstrated substantial magnetoresistance (MR) across a broad temperature range, achieving 26% MR at room temperature under 5 T magnetic field. Furthermore, a maximum TCR value of 2.3% K−1 was observed near the phase transition temperature. These findings highlight the material's potential for dual-mode magnetic and temperature sensing applications in cryogenic environments.