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首页> 外文期刊>Physical review >Incommensurate counterrotating magnetic order stabilized by Kitaev interactions in the layered honeycomb α-Li_2IrO_3
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Incommensurate counterrotating magnetic order stabilized by Kitaev interactions in the layered honeycomb α-Li_2IrO_3

机译:通过层状蜂窝α-Li_2IrO_3中的Kitaev相互作用稳定的不适当的反向旋转磁序

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摘要

The layered honeycomb magnet α-Li_2IrO_3 has been theoretically proposed as a candidate to display unconventional magnetic behaviour associated with Kitaev interactions between spin-orbit entangled j_(eff)= 1/2 magnetic moments on a honeycomb lattice. Here we report single crystal magnetic resonant x-ray diffraction combined with powder magnetic neutron diffraction to reveal an incommensurate magnetic order in the honeycomb layers with Ir magnetic moments counterrotating on nearest-neighbor sites. This unexpected type of magnetic structure for a honeycomb magnet cannot be explained by a spin Hamiltonian with dominant isotropic (Heisenberg) couplings. The magnetic structure shares many key features with the magnetic order in the structural polytypes β- and γ-Li_2IrO_3, understood theoretically to be stabilized by dominant Kitaev interactions between Ir moments located on the vertices of three-dimensional hyperhoneycomb and stripyhoneycomb lattices, respectively. Based on this analogy and a theoretical soft-spin analysis of magnetic ground states for candidate spin Hamiltonians, we propose that Kitaev interactions also dominate in α-Li_2IrO_3, indicative of universal Kitaev physics across all three members of the harmonic honeycomb family of Li_2IrO_3 polytypes.
机译:理论上已经提出层状蜂窝磁体α-Li_2IrO_3作为显示与蜂窝晶格上自旋轨道纠缠的j_(eff)= 1/2磁矩之间的Kitaev相互作用相关的非常规磁行为的候选者。在这里,我们报告单晶磁共振X射线衍射与粉末磁中子衍射相结合,以揭示在蜂窝层中存在不规则的磁序,其中Ir磁矩在最近的位置上反向旋转。蜂窝磁体的这种意想不到的磁性结构无法用具有主要各向同性(Heisenberg)耦合的自旋哈密顿量来解释。磁性结构在结构多型β-和γ-Li_2IrO_3中具有许多与磁性顺序相同的关键特征,从理论上可以理解,它们分别由位于三维超蜂窝网格和条纹蜂窝网格顶点上的Ir矩之间的显性Kitaev相互作用所稳定。基于这种类比和候选自旋哈密顿量的磁性基态的理论软旋转分析,我们建议Kitaev相互作用在α-Li_2IrO_3中也占主导地位,这表明Li_2IrO_3多型谐波蜂窝家族的所有三个成员的通用Kitaev物理学。

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  • 来源
    《Physical review》 |2016年第19期|195158.1-195158.12|共12页
  • 作者单位

    Clarendon Laboratory, University of Oxford Physics Department, Parks Road, Oxford, OX1 3PU, United Kingdom;

    Clarendon Laboratory, University of Oxford Physics Department, Parks Road, Oxford, OX1 3PU, United Kingdom,ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot, OX11 0QX, United Kingdom;

    EP VI, Center for Electronic Correlations and Magnetism, Augsburg University, D-86159 Augsburg, Germany;

    Clarendon Laboratory, University of Oxford Physics Department, Parks Road, Oxford, OX1 3PU, United Kingdom,Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany;

    EP VI, Center for Electronic Correlations and Magnetism, Augsburg University, D-86159 Augsburg, Germany;

    Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA;

    EP VI, Center for Electronic Correlations and Magnetism, Augsburg University, D-86159 Augsburg, Germany,Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50010, USA;

    Diamond Light Source Ltd., Harwell Science and Innovation Campus, OX11 0DE, United Kingdom;

    ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot, OX11 0QX, United Kingdom;

    EP VI, Center for Electronic Correlations and Magnetism, Augsburg University, D-86159 Augsburg, Germany;

    Clarendon Laboratory, University of Oxford Physics Department, Parks Road, Oxford, OX1 3PU, United Kingdom;

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