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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Hexagonal RMnO_3: a model system for twodimensional triangular lattice antiferromagnets
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Hexagonal RMnO_3: a model system for twodimensional triangular lattice antiferromagnets

机译：六角RMnO_3：二维三角晶格反铁磁体的模型系统

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摘要

The hexagonal RMnO_3(h-RMnO_3) are multiferroic materials, which exhibit the coexistence of a magnetic order and ferroelectricity. Their distinction is in their geometry that both results in an unusual mechanism to break inversion symmetry and also produces a two-dimensional triangular lattice of Mn spins, which is subject to geometrical magnetic frustration due to the antiferromagnetic interactions between nearest-neighbor Mn ions. This unique combination makes the h-RMnO_3 a model system to test ideas of spin-lattice coupling, particularly when both the improper ferroelectricity and the Mn trimerization that appears to determine the symmetry of the magnetic structure arise from the same structure distortion. In this review we demonstrate how the use of both neutron and X-ray diffraction and inelastic neutron scattering techniques have been essential to paint this comprehensive and coherent picture of h-RMnO_3.
机译：六角形RMnO_3（h-RMnO_3）是多铁性材料，具有磁序和铁电共存。它们的区别在于它们的几何形状，既导致打破反转对称性的异常机制，又产生Mn自旋的二维三角晶格，由于最邻近的Mn离子之间的反铁磁相互作用，其受到几何磁挫折。这种独特的组合使h-RMnO_3成为测试自旋-晶格耦合思想的模型系统，尤其是当铁电不当和Mn三聚化（似乎决定了磁性结构的对称性）均源于相同的结构变形时。在这篇综述中，我们证明了中子和X射线衍射以及非弹性中子散射技术的使用对于描绘h-RMnO_3的这张全面而连贯的图片至关重要。

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