论文标题
多效O-HOMNO3中的多个磁性排序现象
Multiple magnetic ordering phenomena in multiferroic o-HoMnO3
论文作者
论文摘要
Orthorhombic Homno3是一种多雌性，其中MN抗铁磁阶诱导铁电性。第二个过渡发生在多效相中，其中，铁电化极化的强大增强与HO 4F磁矩的抗磁磁有序同时发生。使用谐振X射线衍射的元素选择性，我们研究Mn 3D和HO 4F矩的磁性。我们明确表明MN磁性受HO 4F磁顺序转变的影响。基于（0 Q 0）和（0 1-Q 0）磁反射的方位角依赖性，我们建议HO 4F阶与TBMNO3中TB 4F先前观察到的均方体相似，TBMNO3类似于AC-clipliid。这与MN顺序不同，MN顺序已经证明这两种材料不同。使用非共振衍射，我们表明磁诱导的铁电晶格失真不受HO顺序的影响，这表明HO顺序通过该机制影响极化而不以与MN顺序相同的方式影响晶格。
Orthorhombic HoMnO3 is a multiferroic in which Mn antiferromagnetic order induces ferroelectricity. A second transition occurs within the multiferroic phase, in which a strong enhancement of the ferroelectric polarization occurs concomitantly to antiferromagnetic ordering of Ho 4f magnetic moments. Using the element selectivity of resonant X-ray diffraction, we study the magnetic order of the Mn 3d and Ho 4f moments. We explicitly show that the Mn magnetic order is affected by the Ho 4f magnetic ordering transition. Based on the azimuthal dependence of the (0 q 0) and (0 1-q 0) magnetic reflections, we suggest that the Ho 4f order is similar to that previously observed for Tb 4f in TbMnO3, which resembles an ac-cycloid. This is unlike the Mn order, which has already been shown to be different for the two materials. Using non-resonant diffraction, we show that the magnetically-induced ferroelectric lattice distortion is unaffected by the Ho ordering, suggesting a mechanism through which the Ho order affects polarization without affecting the lattice in the same manner as the Mn order.
