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Copper compounds, Energy gap, Ferrimagnetism, Manganese compounds, Optical data processing, Perovskite, cupric ion, perovskite, Antiferro-magnetic interactions, Antiferromagnetic interaction, Ferrimagnetic insulators, Ferrimagnetics, High pressure, High temperatures and high pressures, High-pressure condition, Perovskite structures, Synthesised, Temperature-pressure conditions, article, controlled study, electric conductivity, high temperature, hyperbaric pressure, phase transition, Tellurium compounds
Abstract:
CaCu3Mn2Te2O12 was synthesized using high-temperature and high-pressure conditions. The compound possesses an A- and B site ordered quadruple perovskite structure in Pn3̅ symmetry with the charge combination of CaCu32+Mn22+Te26+O12. A ferrimagnetic phase transition originating from the antiferromagnetic interaction between A′ site Cu2+ and B site Mn2+ ions is found to occur at TC ≈ 100 K. CaCu3Mn2Te2O12 also shows insulating electric conductivity. Optical measurement demonstrates the energy bandgap to be about 1.9 eV, in agreement with the high B site degree of chemical order between Mn2+ and Te6+. The first-principles theoretical calculations confirm the Cu2+(↓)-Mn2+(↑) ferrimagnetic coupling as well as the insulating nature with an up-spin direct bandgap. The current CaCu3Mn2Te2O12 provides an intriguing example of an intrinsic ferrimagnetic insulator with promising applications in advanced spintronic devices. © 2023 American Chemical Society.
