High-Temperature Ferrimagnetism Driven by Lattice Distortion in Double Perovskite Ca2FeOsO6,Journal of the American Chemical Society

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High-Temperature Ferrimagnetism Driven by Lattice Distortion in Double Perovskite Ca2FeOsO6
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2014-02-19 , DOI: 10.1021/ja411713q
Hai L. Feng _{1,

2} , Masao Arai ₃ , Yoshitaka Matsushita ₄ , Yoshihiro Tsujimoto ₅ , Yanfeng Guo ₁ , Clastin I. Sathish _{1,

2} , Xia Wang ₁ , Ya-Hua Yuan _{1,

2} , Masahiko Tanaka ₆ , Kazunari Yamaura _{1,

2}

Affiliation

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-3d hybrid ferrimagnetic insulators with high-T(c) is established to develop practically and scientifically useful spintronic materials.

中文翻译：

双钙钛矿Ca2FeOsO6晶格畸变驱动的高温亚铁磁性

5d 和 3d 混合固态氧化物 Ca2FeOsO6 在高压和高温下结晶成具有 P2₁/n 空间群的有序双钙钛矿结构。Ca2FeOsO6 在 ~320 K (T(c)) 的温度下呈现长程亚铁磁转变，并且不是带状绝缘体，但与最近发现的 Sr2CrOsO6 (T(c) ~725 K) 一样具有电绝缘性。Ca2FeOsO6 的电子状态与半金属状态以及 Sr2CrOsO6 的电子状态相邻。此外，高 T(c) 亚铁磁性是由晶格畸变驱动的，这是首次在双钙钛矿氧化物中观察到，代表自旋和轨道之间复杂的相互作用。与传统的铁氧体和石榴石不同，这种相互作用可能在亚铁磁性中起关键作用。

更新日期：2014-02-19

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