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首页> 外文期刊>Physical review >Spin crossover, structural change, and metallization in NiAs-type FeO at high pressure
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Spin crossover, structural change, and metallization in NiAs-type FeO at high pressure

机译:NiAs型FeO在高压下的自旋交叉,结构变化和金属化

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摘要

We report high-spin to low-spin crossover of iron in NiAs (B8)-type Fe_(0.96)O (FeO hereafter) at high pressure by a combination of in-situ x-ray emission spectroscopy (XES) and x-ray diffraction (XRD) measurements. The XES spectra show a loss of spin in B8-type FeO approximately above 119 Gpa at 300 K, consistent with the ~2.5% volume reduction around 120 Gpa. The high-temperature XRD study also demonstrates a similar volume decrease at 1560-1780 K under the same pressure condition. While the crystal structure of FeO remains to be B8 type across such volume reduction, the atomic arrangements of Fe and O change from inverse to normal NiAs form with considerable decrease in c/a axial ratio. With recent electrical resistance measurements, these suggest that iron spin crossover, inverse-normal structural change, and insulator-metal transition occur concurrently in B8 FeO around 120 Gpa.
机译:我们结合原位X射线发射光谱(XES)和X射线报告了NiAs(B8)型Fe_(0.96)O(以下称FeO)在高压下铁的高旋向低旋交叉衍射(XRD)测量。 XES光谱显示在300 K时,大约在119 Gpa以上的B8型FeO自旋损失,与120 Gpa时约2.5%的体积减少一致。高温XRD研究还表明,在相同压力条件下,1560-1780 K处的体积减少量相似。尽管在这种体积减小中FeO的晶体结构仍为B8型,但Fe和O的原子排列从反NiAs变为正态NiAs,而c / a轴向比却大大降低。通过最近的电阻测量,这些表明在120 Gpa附近的B8 FeO中同时发生铁自旋交叉,逆法向结构变化和绝缘体-金属转变。

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  • 来源
    《Physical review》 |2011年第13期|p.134417.1-134417.6|共6页
  • 作者单位

    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan,Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan;

    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan,Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan;

    Center for Quantum Science and Technology under Extreme Conditions, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan;

    National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan;

    National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan;

    Japan Synchrotron Radiation Research Institute, 1-1-1 Koto, Sayo, Hyogo 679-5198, Japan;

    Department of Earth and Planetary Sciences, Kobe University, l-l Rokkodai-cho, Nada, Kobe 657-8501, Japan;

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  • 正文语种 eng
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  • 关键词

    spin crossover; high-pressure behavior; magnetic and electric properties; environmental magnetism;

    机译:旋转分频器高压行为磁和电性能;环境磁;

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