A transition-metal oxide of PbCu₃Mn₄O₁₂ was prepared at 1523 K and 10 GPa. An A-site-ordered quadruple perovskite structure with the space group Im3̅ is assigned for this compound. Based on bond-valence-sum calculations and X-ray absorption spectroscopy, the charge combination is determined to be PbCu₃²⁺Mn₄⁴⁺O₁₂. Due to Cu²⁺(↑)–Mn⁴⁺(↓) antiferromagnetic coupling, a near-room-temperature ferrimagnetic phase transition is observed at approximately 287 K. PbCu₃Mn₄O₁₂ exhibits a semiconducting electric transport property with the energy band gap E_g ≈ 0.2 eV. In addition, considerable low-field magnetoresistance effects are observed at lower temperatures. This study provides an intrinsic near-room-temperature ferrimagnetic semiconductor that exhibits potential applications in next-generation spintronic devices.

中文翻译：

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近室温亚铁磁序半导体 PbCu3Mn4O12 的高压合成

在1523 K和10 GPa下制备了PbCu ₃ Mn ₄ O ₁₂过渡金属氧化物。该化合物具有空间群Im 3̅的 A 位有序四重钙钛矿结构。基于键价和计算和X射线吸收光谱，确定电荷组合为PbCu ₃ ²⁺ Mn ₄ ⁴⁺ O ₁₂。由于 Cu ²⁺ (↑)–Mn ⁴⁺ (↓) 反铁磁耦合，在大约 287 K 时观察到近室温的亚铁磁相变。PbCu ₃ Mn ₄ O ₁₂在能带上表现出半导体电传输特性能隙E _g ≈ 0.2 eV。此外，在较低温度下观察到相当大的低场磁阻效应。这项研究提供了一种本征近室温亚铁磁半导体，在下一代自旋电子器件中具有潜在的应用前景。