LaMn3Ni2Mn2O12: An A- and B-Site Ordered Quadruple Perovskite with A-Site Tuning Orthogonal Spin Ordering

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• 作者：Yun-Yu Yin ; Min Liu ; Jian-Hong Dai ; Xiao Wang ; Long Zhou ; Huibo Cao ; Clarina dela Cruz ; Chien-Te Chen ; Yuanji Xu ; Xi Shen ; Richeng Yu ; José Antonio Alonso ; Angel Muñoz ; Yi-Feng Yang ; Changqing Jin ; Zhiwei Hu ; Youwen Long
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 27, 2016
• 年：2016
• 卷：28
• 期：24
• 页码：8988-8996
• 全文大小：585K
• ISSN：1520-5002

文摘

A new oxide, LaMn₃Ni₂Mn₂O₁₂, was prepared by high-pressure and high-temperature synthesis methods. The compound crystallizes in an AA′₃B₂B′₂O₁₂-type A-site and B-site ordered quadruple perovskite structure. The charge combination is confirmed to be LaMn³⁺₃Ni²⁺₂Mn⁴⁺₂O₁₂, where La and Mn³⁺ are 1:3 ordered at the A and A′ sites and the Ni²⁺ and Mn⁴⁺ are also distributed at the B and B′ sites in an orderly fashion in a rocksalt-type manner, respectively. A G-type antiferromagnetic ordering originating from the A′-site Mn³⁺ sublattice is found to occur at T_N ≈ 46 K. Subsequently, the spin coupling between the B-site Ni²⁺ and B′-site Mn⁴⁺ sublattices leads to an orthogonally ordered spin alignment with a net ferromagnetic component near T_C ≈ 34 K. First-principles calculations demonstrate that the A′-site Mn³⁺ spins play a crucial role in determining the spin structure of the B and B′ sites. This LaMn₃Ni₂Mn₂O₁₂ provides a rare example that shows orthogonal spin ordering in the B and B′ sites assisted by ordered A-site magnetic ions in perovskite systems.