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Partial antiferromagnetic helical order in single-crystal Fe_3PO_4O_3

机译：单晶fe_3po_4o_3中的部分反铁磁螺旋顺序

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摘要

Magnetic frustration in Fe_3PO_4O_3 produces an unusual magnetic state below T_N = 163 K, where incommensurate antiferromagnetic order is restricted to nanosized needle-like domains, as inferred from neutron powder diffraction. Here we show using single-crystal neutron diffraction that Fe_3PO_4O_3 does not exhibit a preferred ordering wave vector direction in the ab plane despite having a well-defined ordering wave vector length. This results in the observation of continuous rings of scattering rather than satellite Bragg peaks. The lack of a preferred incommensurate ordering wave vector direction can be understood in terms of an antiferromagnetic Heisenberg model with nearest-neighbor (J_1) and second-neighbor (J_2) interactions, which produce a quasidegenerate manifold of ordering wave vectors. This state appears to be similar to the partially ordered phase of MnSi. but in Fe_3PO_4O_3 arises in a frustrated antiferromagnet rather than a chiral ferromagnet.
机译：Fe_3PO_4O_3中的磁挫折在T_N = 163K以下产生不寻常的磁力状态，其中将所得的反铁磁序列限制在中子粉末衍射中的推断下来纳入纳米针状畴。在这里，我们以单晶中子衍射显示FE_3PO_4O_3尽管具有明确定义的排序波矢量长度，但FE_3PO_4O_3在AB平面中没有表现出优选的订购波矢量方向。这导致观察散射连续环而不是卫星布拉格峰。可以根据具有与最近邻（J_1）和第二邻（J_2）相互作用的反铁磁性Heisenberg模型来理解优选的联交排序波矢量方向，其产生有序波矢量的Quaside Generate歧管。该状态似乎类似于MNSI的部分有序相位。但在FE_3PO_4O_3中，令人沮丧的反霉素而不是手性铁磁体。

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  • 来源
    《Physical review》 |2020年第18期|184417.1-184417.9|共9页
  • 作者

    C. L. Sarkis; M.J. Tarne; J. R. Neilson; H. B. Cao; E. Coldren; M. P. Gelfand; K. A. Ross;

  • 作者单位

    Department of Physics Colorado State University Fort Collins Colorado 80523-1875 USA;

    Department of Chemistry Colorado State University Fort Collins Colorado 80523-1872 USA;

    Department of Chemistry Colorado State University Fort Collins Colorado 80523-1872 USA;

    Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37748 USA;

    Department of Physics Colorado State University Fort Collins Colorado 80523-1875 USA;

    Department of Physics Colorado State University Fort Collins Colorado 80523-1875 USA;

    Department of Physics Colorado State University Fort Collins Colorado 80523-1875 USA Quantum Materials Program CIFAR MaRS Centre West Tower 661 University Avenue Suite 505 Toronto Ontario M5G 1M1 Canada;

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