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<p>15<i>R</i>-BaMnO<sub>3</sub> as a perovskite manganite known for its antiferromagnetic and other physical properties, However, their transport properties, magnetoresistance (MR), temperature coefficient of resistance (TCR) and magnetic entropy change are rarely reported. In this work, these physical properties of the 15<i>R</i>-BaMnO<sub>3</sub> sample with uniform morphology and correct stoichiometry are investigated. Magnetic measurements show antiferromagnetic ordering below the Néel temperature (T<sub>N</sub>≈233&#xa0;K), with spins aligned ferromagnetically within planes and antiferromagnetically between layers. Below 50&#xa0;K, spin canting induces weak ferromagnetism. Magnetotransport studies reveal significant negative MR, with a maximum of -11.6% at approximately 271&#xa0;K under 6 T field. At 220&#xa0;K, the TCR reaches its maximum value of 6.1%·K⁻<sup>1</sup> and reaches an excellent value of −3.06%·K⁻<sup>1</sup> near room temperature. Fitting the paramagnetic ρ(T) data to transport models indicates the existence of small-polaron (SP) hopping mechanism. The entropy change (ΔS<sub>M</sub>), calculated via the Maxwell relation, reaching a maximum value of 0.133&#xa0;J/kg·K at 49&#xa0;K under 5 T. These results highlight the strong unique properties of crystal structure, magnetism, and transport behavior in 15<i>R</i>-BaMnO<sub>3</sub>, filling the research gap in its transport and magnetocaloric fields.</p>

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The Structure, Magnetic Properties and Magnetotransport of 15R-BaMnO3 Manganite

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Junran Li,
  • Haochen Wang,
  • Weishi Tan,
  • Haiou Wang

摘要

15R-BaMnO3 as a perovskite manganite known for its antiferromagnetic and other physical properties, However, their transport properties, magnetoresistance (MR), temperature coefficient of resistance (TCR) and magnetic entropy change are rarely reported. In this work, these physical properties of the 15R-BaMnO3 sample with uniform morphology and correct stoichiometry are investigated. Magnetic measurements show antiferromagnetic ordering below the Néel temperature (TN≈233 K), with spins aligned ferromagnetically within planes and antiferromagnetically between layers. Below 50 K, spin canting induces weak ferromagnetism. Magnetotransport studies reveal significant negative MR, with a maximum of -11.6% at approximately 271 K under 6 T field. At 220 K, the TCR reaches its maximum value of 6.1%·K⁻1 and reaches an excellent value of −3.06%·K⁻1 near room temperature. Fitting the paramagnetic ρ(T) data to transport models indicates the existence of small-polaron (SP) hopping mechanism. The entropy change (ΔSM), calculated via the Maxwell relation, reaching a maximum value of 0.133 J/kg·K at 49 K under 5 T. These results highlight the strong unique properties of crystal structure, magnetism, and transport behavior in 15R-BaMnO3, filling the research gap in its transport and magnetocaloric fields.