论文标题
来自局部磁电磁多物的中子散射：合并的理论，计算和实验透视图
Neutron scattering from local magnetoelectric multipoles: a combined theoretical, computational, and experimental perspective
论文作者
论文摘要
在存在磁化密度的局部非中心不对称的情况下，我们解决了磁性中子散射。这种反演对称性破裂，结合缺乏时间反转对称性，可以用磁电多物种来描述，磁电偶极子在磁化密度的多极扩展中形成第二项。我们提供了磁性中子衍射的理论形式，就散射横截面的多产膨胀而言。特别是，我们展示了如何从从头算计算开始，以计算磁电多物对散射幅度的贡献。我们还提供了有关如何使用非极化或极化中子散射实验检测长期磁性多物的长期磁性多数的一般指南。作为一个案例研究，我们通过将理论第一原则预测与实验球形中子偏光仪测量进行比较，搜索CUO中磁电多物的存在。
We address magnetic neutron scattering in the presence of local non-centrosymmetric asymmetries of the magnetization density. Such inversion-symmetry breaking, combined with the absence of time-reversal symmetry, can be described in terms of magnetoelectric multipoles which form the second term after the magnetic dipole in the multipole expansion of the magnetization density. We provide a pedagogical review of the theoretical formalism of magnetic neutron diffraction in terms of the multipole expansion of the scattering cross-section. In particular, we show how to compute the contribution of magnetoelectric multipoles to the scattering amplitude starting from ab initio calculations. We also provide general guidelines on how to experimentally detect long-ranged order of magnetoelectric multipoles using either unpolarized or polarized neutron scattering. As a case study, we search for the presence of magnetoelectric multipoles in CuO by comparing theoretical first-principle predictions with experimental spherical neutron polarimetry measurements.
