CaCu 3 Mn 2 Te 2 O 12 : An Intrinsic Ferrimagnetic Insulator Prepared Under High Pressure.

CaCu 3 Mn 2 Te 2 O 12 was synthesized using high-temperature and high-pressure conditions. The compound possesses an A- and B site ordered quadruple perovskite structure in Pn 3̅ symmetry with the charge combination of CaCu 3 2+ Mn 2 2+ Te 2 6+ O 12 . A ferrimagnetic phase transition originating from the antiferromagnetic interaction between A' site Cu 2+ and B site Mn 2+ ions is found to occur at T C ≈ 100 K. CaCu 3 Mn 2 Te 2 O 12 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 Mn 2+ and Te 6+ . The first-principles theoretical calculations confirm the Cu 2+ (↓)-Mn 2+ (↑) ferrimagnetic coupling as well as the insulating nature with an up-spin direct bandgap. The current CaCu 3 Mn 2 Te 2 O 12 provides an intriguing example of an intrinsic ferrimagnetic insulator with promising applications in advanced spintronic devices.