Sc2NiMnO6: A Double-Perovskite with a Magnetodielectric Response Driven by Multiple Magnetic Orders

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• 作者：Wei Yi ; Andrew J. Princep ; Yanfeng Guo ; Roger D. Johnson ; Dmitry Khalyavin ; Pascal Manuel ; Anatoliy Senyshyn ; Igor A. Presniakov ; Alexey V. Sobolev ; Yoshitaka Matsushita ; Masahiko Tanaka ; Alexei A. Belik ; Andrew T. Boothroyd
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：August 17, 2015
• 年：2015
• 卷：54
• 期：16
• 页码：8012-8021
• 全文大小：700K
• ISSN：1520-510X

文摘

Perovskite materials provide a large variety of interesting physical properties and applications. Here, we report on unique properties of a fully ordered magnetodielectric double-perovskite, Sc₂NiMnO₆ (space group P2₁/n, a = 4.99860 脜, b = 5.35281 脜, c = 7.34496 脜, and 尾 = 90.7915掳), exhibiting sequential magnetic transitions at T₁ = 35 K and T₂ = 17 K. The transition at T₁ corresponds to a single-k antiferromagnetic phase with propagation vector k₁ = (1/2, 0, 1/2), while the second transition at T₂ corresponds to a 2-k magnetic structure with propagation vectors k₁ = (1/2, 0, 1/2) and k₂ = (0, 1/2, 1/2). Symmetry analysis suggests that the two ordering wave vectors are independent, and calculations imply that k₁ is associated with the Mn sublattice and k₂ with the Ni sublattice, suggesting that Mn鈥揘i coupling is very small or absent. A magnetodielectric anomaly at T₂ likely arises from an antiferroelectric ordering that results from the exchange-striction between the two magnetic sublattices belonging to k₁ and k₂. The behavior of Sc₂NiMnO₆ demonstrates 3d double-perovskites with small A-site cations as a promising avenue in which to search for magnetoelectric materials.