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首页> 外文期刊>Physical review >Zigzag antiferromagnetic quantum ground state in monoclinic honeycomb lattice antimonates A_3Ni_2SbO_6 (A = Li, Na)
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Zigzag antiferromagnetic quantum ground state in monoclinic honeycomb lattice antimonates A_3Ni_2SbO_6 (A = Li, Na)

机译：单斜蜂窝晶格中的之字形反铁磁量子基态锑化A_3Ni_2SbO_6（A = Li，Na）

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摘要

We present a comprehensive experimental and theoretical study of the electronic and magnetic properties of two quasi-two-dimensional (2D) honeycomb lattice monoclinic compounds A_3Ni_2SbO_6 (A = Li, Na). Magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long-range order with Neel temperatures of ～14 and 16 K for Li_3Ni_2SbO_6 and Na_3Ni_2SbO_6, respectively. The effective magnetic moments of 4.3 μB/f.u. (Li_3Ni_2SbO_6) and 4.4μB/f.u. (Na_3Ni_2SbO_6), where f.u. is formula units, indicate that Ni~(2+) is in a high-spin configuration (5 = 1). The temperature dependence of the inverse magnetic susceptibility follows the Curie-Weiss law in the high-temperature region and shows positive values of the Weiss temperature, ～8 K (Li_3Ni_2SbO_6) and ～12 K (Na_3Ni_2SbO_6), pointing to the presence of nonnegligible ferromagnetic interactions, although the system orders antiferromagnetically at low temperatures. In addition, the magnetization curves reveal a field-induced (spin-flop type) transition below T_N that can be related to the magnetocrystalline anisotropy in these systems. These observations are in agreement with density functional theory calculations, which show that both antiferromagnetic and ferromagnetic intralayer spin exchange couplings between Ni~(2+) ions are present in the honeycomb planes, supporting a zigzag antiferromagnetic ground state. Based on our experimental measurements and theoretical calculations, we propose magnetic phase diagrams for the two compounds.
机译：我们目前对两种准二维（2D）蜂窝晶格单斜晶系化合物A_3Ni_2SbO_6（A = Li，Na）的电子和磁性进行全面的实验和理论研究。 Li_3Ni_2SbO_6和Na_3Ni_2SbO_6的磁化率和比热数据分别与Neel温度分别为〜14和16 K的反铁磁长程序列一致。有效磁矩为4.3μB/ f.u。 （Li_3Ni_2SbO_6）和4.4μB/ f.u。 （Na_3Ni_2SbO_6），其中f.u.是公式单位，表示Ni〜（2+）处于高自旋构型（5 = 1）。逆磁化率的温度依赖性在高温区域遵循居里-魏斯定律，并且显示出魏斯温度的正值，分别为〜8 K（Li_3Ni_2SbO_6）和〜12 K（Na_3Ni_2SbO_6），表明存在不可忽略的铁磁相互作用，尽管系统在低温下反铁磁性。另外，磁化曲线揭示了在T_N以下的场感应（自旋型）跃迁，这可能与这些系统中的磁晶各向异性有关。这些观察结果与密度泛函理论计算相一致，后者表明蜂窝平面中存在Ni〜（2+）离子之间的反铁磁层和铁磁层内自旋交换耦合，从而支持Z字形反铁磁基态。根据我们的实验测量和理论计算，我们提出了这两种化合物的磁相图。

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  • 来源
    《Physical review》 |2015年第14期|144401.1-144401.12|共12页
  • 作者

    E. A. Zvereva; M. I. Stratan; Y. A. Ovchenkov; V. B. Nalbandyan; J.-Y. Lin; E. L. Vavilova; M. F. Iakovleva4M. Abdel-Hafiez; A. V. Silhanek; X.-J. Chen; A. Stroppa; S. Picozzi; H. O. Jeschke; R. Valenti; A. N. Vasiliev;

  • 作者单位

    Faculty of Physics, Moscow State University, 119991 Moscow, Russia;

    Faculty of Physics, Moscow State University, 119991 Moscow, Russia;

    Faculty of Physics, Moscow State University, 119991 Moscow, Russia;

    Chemistry Faculty, Southern Federal University, 344090 Rostov-on-Don, Russia;

    National Chiao Tung University, Hsinchu, Taiwan, 300 Republic of China;

    Zavoisky Physical-Technical Institute (ZPhTI) of the Kazan Scientific Center of the Russian Academy of Sciences, 420029 Kazan, Russia;

    Departement de Physique, Liege University-Belgium, B-4000 Liege, Belgium,Faculty of Science, Physics Department, Fayoum University, 63514 Fayoum, Egypt,Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai, 201203, China;

    Departement de Physique, Liege University-Belgium, B-4000 Liege, Belgium;

    Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai, 201203, China;

    Consiglio Nazionale delle Ricerche (CNR) SPIN, 67010 Coppito, L'Aquila, Italy;

    Consiglio Nazionale delle Ricerche (CNR) SPIN, 67010 Coppito, L'Aquila, Italy;

    Institut fuer Theoretische Physik, Goethe-Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany;

    Institut fuer Theoretische Physik, Goethe-Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany;

    Faculty of Physics, Moscow State University, 119991 Moscow, Russia,Theoretical Physics and Applied Mathematics Department, Ural Federal University, 620002 Ekaterinburg, Russia,National University of Science and Technology 'MISiS,' Moscow 119049, Russia;

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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); crystal-field theory and spin hamiltonians; magnetic anisotropy; exchange and superexchange interactions;

    机译：磁相边界（包括磁跃迁;超磁性等）;晶体场理论和自旋哈密顿论;磁各向异性交换和超交换交互;

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