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<p>Ortho-manganites are considered as promising candidates in ferro-electro-magnetism. The colossal magneto-resistive material demonstrates a first-order phase transition from a paramagnetic to a ferromagnetic state (TC), along with a transition from insulator to metallic behavior, meaning a change in resistivity. Here, we report synthesis and characterization of colossal magneto-resistive material 'pure LCMO' and 'LCMO-30% Au doped composite'. The results indicate that metal–insulator transition temperature was approximately 268&#xa0;K for the LCMO-30% Au composite along with highest magneto-resistance (MR) of ~ −&#xa0;63.8% at 268&#xa0;K under 7&#xa0;T applied magnetic field. Meanwhile, for the LCMO-30% Au composite, the maximum temperature coefficient of resistance (TCR) of ~ 11.02%/K was observed at 263&#xa0;K and 1.77% at 275&#xa0;K; in contrast, the pure LCMO exhibited a TCR of 2.36%/K at 260&#xa0;K. The results indicate that the magneto-resistive properties of the LCMO-30% Au composite are significantly superior compared to the pure LCMO which is due to the fact that gold either accumulates at the grain boundaries (GBs) or on the surfaces of the LCMO grains, acting as an additive at the GBs without integrating into the primary LCMO lattice. Ultimately, results obtained were compared with the existing ones and demonstrated improvements over previously reported findings.</p>

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Analysis of the temperature controlled magneto-transport properties and magnetization: role of introducing Au in La2/3Ca1/3MnO3 (LCMO)

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Navjyoti Boora,
  • Rana Tabassum,
  • Shafaque Rahman,
  • A. K. Hafiz

摘要

Ortho-manganites are considered as promising candidates in ferro-electro-magnetism. The colossal magneto-resistive material demonstrates a first-order phase transition from a paramagnetic to a ferromagnetic state (TC), along with a transition from insulator to metallic behavior, meaning a change in resistivity. Here, we report synthesis and characterization of colossal magneto-resistive material 'pure LCMO' and 'LCMO-30% Au doped composite'. The results indicate that metal–insulator transition temperature was approximately 268 K for the LCMO-30% Au composite along with highest magneto-resistance (MR) of ~ − 63.8% at 268 K under 7 T applied magnetic field. Meanwhile, for the LCMO-30% Au composite, the maximum temperature coefficient of resistance (TCR) of ~ 11.02%/K was observed at 263 K and 1.77% at 275 K; in contrast, the pure LCMO exhibited a TCR of 2.36%/K at 260 K. The results indicate that the magneto-resistive properties of the LCMO-30% Au composite are significantly superior compared to the pure LCMO which is due to the fact that gold either accumulates at the grain boundaries (GBs) or on the surfaces of the LCMO grains, acting as an additive at the GBs without integrating into the primary LCMO lattice. Ultimately, results obtained were compared with the existing ones and demonstrated improvements over previously reported findings.