High-Pressure Synthesis of Semiconducting PbCu3Mn4O12 with Near-Room-Temperature Ferrimagnetic Order

• Published in: Inorganic chemistry Vol. 63; no. 13; pp. 5924 - 5930
• Main Authors: Zhao, Haoting, Lu, Dabiao, Wang, Xiao, Ye, Xubin, Zhang, Jie, Pi, Maocai, Pan, Zhao, Chin, Yi-Ying, Chen, Chien-Te, Hu, Zhiwei, Long, Youwen
• Format: Journal Article
• Language: English
• Published: American Chemical Society 01.04.2024
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.3c04493

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 PbCu3 2+Mn4 4+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.