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<p>Oxygen plasma treatment of Pr<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> manganite for 1, 5, and 10&#xa0;min is used to tune its functional response by modification of surface microstructure and defect creation by altering surface oxygen stoichiometry. This exhibits a systematic expansion of lattice parameters and an increase in Mn-O bond lengths, while the Mn-O-Mn bond angles remains unchanged. Rietveld refinement of X-ray diffraction data using the orthorhombic <i>Pbnm</i> space group as reference, confirms phase purity for all samples. The temperature-dependent resistivity measurements shows that pristine PCMO exhibits a well-defined metal-insulator transition (MIT) at ~ 122&#xa0;K. However, oxygen plasma exposure induces significant modifications in the electrical transport behaviour. One minute of oxygen plasma treatment increases the resistivity sharply which suppresses the MIT. As oxygen plasma exposure duration is increased to 5 and 10&#xa0;min, the electrical resistivity decreases progressively, indicating a partial recovery of electrical conduction for longer durations. Metallic conduction, small polaron hopping, and variable-range hopping models are applied to identify the dominant transport mechanisms across different temperature regimes.</p>

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Investigation of the functional response of Pr0.7Ca0.3MnO3 to oxygen plasma-induced surface modification due to oxygen stoichiometry variation

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Nopu Ongay Bhutia,
  • Utpal Deka,
  • Poojitha G,
  • Ashok Rao,
  • Saravanan A

摘要

Oxygen plasma treatment of Pr0.7Ca0.3MnO3 manganite for 1, 5, and 10 min is used to tune its functional response by modification of surface microstructure and defect creation by altering surface oxygen stoichiometry. This exhibits a systematic expansion of lattice parameters and an increase in Mn-O bond lengths, while the Mn-O-Mn bond angles remains unchanged. Rietveld refinement of X-ray diffraction data using the orthorhombic Pbnm space group as reference, confirms phase purity for all samples. The temperature-dependent resistivity measurements shows that pristine PCMO exhibits a well-defined metal-insulator transition (MIT) at ~ 122 K. However, oxygen plasma exposure induces significant modifications in the electrical transport behaviour. One minute of oxygen plasma treatment increases the resistivity sharply which suppresses the MIT. As oxygen plasma exposure duration is increased to 5 and 10 min, the electrical resistivity decreases progressively, indicating a partial recovery of electrical conduction for longer durations. Metallic conduction, small polaron hopping, and variable-range hopping models are applied to identify the dominant transport mechanisms across different temperature regimes.