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首页> 外文期刊>Physical review >Ba_2NiOsO_6: A Dirac-Mott insulator with ferromagnetism near 100 K
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Ba_2NiOsO_6: A Dirac-Mott insulator with ferromagnetism near 100 K

机译：Ba_2NiOsO_6：铁磁性接近100 K的Dirac-Mott绝缘子

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摘要

The ferromagnetic semiconductor Ba_2NiOsO_6 (T_(mag) ~ 100 K) was synthesized at 6 GPa and 1500℃. It crystallizes into a double perovskite structure [Fm-3m; a = 8.0428(1) A], where the Ni~(2+) and Os~(6+) ions are perfectly ordered at the perovskite B site. We show that the spin-orbit coupling of Os~(6+) plays an essential role in opening the charge gap. The magnetic state was investigated by density functional theory calculations and powder neutron diffraction. The latter revealed a collinear ferromagnetic order in a >21 kOe magnetic field at 5 K. The ferromagnetic gapped state is fundamentally different from that of known dilute magnetic semiconductors such as (Ga,Mn)As and (Cd,Mn)Te (T_(mag) < 180K), the spin-gapless semiconductor Mn_2CoAl (T_(mag) ～ 720 K), and the ferromagnetic insulators EuO (T_(mag) ～ 70 K) and Bi_3Cr_3O_(11) (T_(mag) ～ 220 K). It is also qualitatively different from known ferrimagnetic insulators and semiconductors, which are characterized by an antiparallel spin arrangement. Our finding of the ferromagnetic semiconductivity of Ba_2NiOsO_6 should increase interest in the platinum group oxides, because this alternative class of materials should be useful in the development of spintronic, quantum magnetic, and related devices.
机译：在6 GPa和1500℃下合成了铁磁半导体Ba_2NiOsO_6（T_（mag）〜100 K）。结晶为钙钛矿双结构[Fm-3m； a = 8.0428（1）A]，其中钙钛矿B处的Ni〜（2+）和Os〜（6+）离子完全有序。我们表明，Os〜（6+）的自旋轨道耦合在打开电荷隙中起着至关重要的作用。通过密度泛函理论计算和粉末中子衍射研究了磁态。后者在大于21 kOe的磁场下于5 K下显示共线铁磁顺序。铁磁带隙状态与已知的稀磁半导体如（Ga，Mn）As和（Cd，Mn）Te（T_（ mag）<180K），无自旋间隙半导体Mn_2CoAl（T_（mag）〜720 K），铁磁绝缘体EuO（T_（mag）〜70 K）和Bi_3Cr_3O_（11）（T_（mag）〜220 K） 。它在质量上也与已知的亚铁磁性绝缘体和半导体不同，后者的特征是反平行自旋排列。我们对Ba_2NiOsO_6的铁磁半导体性的发现应该增加人们对铂族氧化物的兴趣，因为这种替代材料类别对自旋电子，量子磁性及相关器件的开发应是有用的。

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  • 来源
    《Physical review》 |2016年第23期|235158.1-235158.9|共9页
  • 作者

    Hai L. Feng; Stuart Calder; Madhav Prasad Ghimire; Ya-Hua Yuan; Yuichi Shirako; Yoshihiro Tsujimoto; Yoshitaka Matsushita; Zhiwei Hu; Chang-Yang Kuo; Liu Hao Tjeng; Tun-Wen Pi; Yun-Liang Soo; Jianfeng He; Masahiko Tanaka; Yoshio Katsuya; Manuel Richter; Kazunari Yamaura;

  • 作者单位

    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Leibniz Institute for Solid State and Materials Research, IFW Dresden, P.O. Box270116, D-01171 Dresden, Germany,Condensed Matter Physics Research Center, Butwal-13, Rupandehi, Lumbini, Nepal;

    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;

    Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan,Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan;

    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;

    Materials Analysis Station, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;

    Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany;

    National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;

    National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan,Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan;

    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;

    Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Kouto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan;

    Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Kouto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan;

    Leibniz Institute for Solid State and Materials Research, IFW Dresden, P.O. Box270116, D-01171 Dresden, Germany,Dresden Center for Computational Materials Science, DCMS, TU Dresden, D-01069 Dresden, Germany;

    Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan;

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