High-Temperature Ferrimagnetism Driven by Lattice Distortion in Double Perovskite Ca2FeOsO6

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• 作者：Hai L. Feng ; Masao Arai ; Yoshitaka Matsushita ; Yoshihiro Tsujimoto ; Yanfeng Guo ; Clastin I. Sathish ; Xia Wang ; Ya-Hua Yuan ; Masahiko Tanaka ; Kazunari Yamaura
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：March 5, 2014
• 年：2014
• 卷：136
• 期：9
• 页码：3326-3329
• 全文大小：242K
• 年卷期：v.136,no.9(March 5, 2014)
• ISSN：1520-5126

文摘

5d and 3d hybrid solid-state oxide Ca₂FeOsO₆ crystallizes into an ordered double-perovskite structure with a space group of P2₁/n with high-pressures and temperatures. Ca₂FeOsO₆ presents a long-range ferrimagnetic transition at a temperature of 320 K (T_c) and is not a band insulator, but is electrically insulating like the recently discovered Sr₂CrOsO₆ (T_c 725 K). The electronic stat of Ca₂FeOsO₆ is adjacent to a half-metallic state as well as that of Sr₂CrOsO₆. In addition, the high-T_c ferrimagnetism was driven by lattice distortion, which was observed for the first time among double-perovskite oxides and represents complex interplays between spins and orbitals. Unlike conventional ferrite and garnet, the interplays likely play a pivotal role of the ferrimagnetism. A new class of 5d鈥?d hybrid ferrimagnetic insulators with high-T_c is established to develop practically and scientifically useful spintronic materials.