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首页> 外文期刊>Physical review >Symmetry of reentrant tetragonal phase in Ba_(1-x)Na_xFe_2As_2: Magnetic versus orbital ordering mechanism
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Symmetry of reentrant tetragonal phase in Ba_(1-x)Na_xFe_2As_2: Magnetic versus orbital ordering mechanism

机译：Ba_（1-x）Na_xFe_2As_2中凹角四方相的对称性：磁性与轨道有序机制

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摘要

Magnetostructural phase transitions in Ba_(1-x)Na_xFe_2As_2 (A = K, Na) materials are discussed for both magnetically and orbitally driven mechanisms, using a symmetry analysis formulated within the Landau theory of phase transitions. Both mechanisms predict identical orthorhombic space-group symmetries for the nematic and magnetic phases observed over much of the phase diagram, but they predict different tetragonal space-group symmetries for the newly discovered reentrant tetragonal phase in Ba_(1-x)Na_xFe_2As_2 (x ～ 0.24-0.28). In a magnetic scenario, magnetic order with moments along the c axis, as found experimentally, does not allow any type of orbital order, but in an orbital scenario, we have determined two possible orbital patterns, specified by P4/mnc1' and I4221' space groups, which do not require atomic displacements relative to the parent I4/mmm1' symmetry and, in consequence, are indistinguishable in conventional diffraction experiments. We demonstrate that the three possible space groups are, however, distinct in resonant x-ray Bragg diffraction patterns created by Templeton & Templeton scattering. This provides an experimental method of distinguishing between magnetic and orbital models.
机译：利用Landau相变理论中的对称分析，讨论了Ba_（1-x）Na_xFe_2As_2（A = K，Na）材料中的磁结构相变，涉及磁性和轨道驱动机理。两种机制都可以预测在相图中大部分观察到的向列相和磁相的正交相空间群对称性，但是对于Ba_（1-x）Na_xFe_2As_2（x〜 0.24-0.28）。在磁性场景中，实验发现沿c轴带有力矩的磁阶不允许任何类型的轨道序，但是在轨道场景中，我们确定了两种可能的轨道模式，分别由P4 / mnc1'和I4221'指定空间组不需要相对于母体I4 / mmm1'的对称性进行原子位移，因此在常规衍射实验中是无法区分的。我们证明了这三个可能的空间群在通过Templeton和Templeton散射产生的共振X射线布拉格衍射图谱上是不同的。这提供了区分磁性模型和轨道模型的实验方法。

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  • 来源
    《Physical review》 |2014年第17期|174511.1-174511.12|共12页
  • 作者

    D. D. Khalyavin; S. W. Lovesey; P. Manuel; F. Krueger; S. Rosenkranz; J. M. Allred; O. Chmaissem; R. Osborn;

  • 作者单位

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11-0QX, UK;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11-0QX, UK,Diamond Light Source Ltd., Didcot, Oxfordshire OX11 0DE, UK;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11-0QX, UK;

    ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11-0QX, UK,London Centre for Nanotechnology, University College London, Gordon Street, London WC1H 0AH, UK;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA;

    Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA,Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA;

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