标题： 一种关于共线反铁磁体Li2Ni3P4O14的共振X射线布拉格衍射的案例 显示英文标题

标题： A case for resonant x-ray Bragg diffraction by a collinear antiferromagnet Li2Ni3P4O14

摘要： 磁轴向和极性(狄拉克)镍多极在单斜Li2Ni3P4O14的对称性分析中对共振X射线布拉格振幅有贡献，该分析为未来的衍射实验提供了依据。 在14.5 K以下的温度下，磁长程有序可被视为二维三聚反铁磁体，其中Ni离子位于中心对称磁空间群P21/c的两个Wyckoff位置上。 它允许与初级X射线束的圆偏振耦合，这与由反倒置和线性磁电效应表征的相应反铁磁体的衍射不同，例如历史意义重大的铬 sesquioxide (Cr2O3) 和 Cu2(MoO4)(SeO3) (Lovesey & van der Laan, 2024)。 空间群是从中子布拉格衍射图样推断出来的，未考虑允许的狄拉克偶极子(各向异性偶极子)和四极子(Chikara等, 2025)。 显示英文摘要

摘要： Magnetic axial and polar (Dirac) nickel multipoles contribute to resonant x-ray Bragg amplitudes in a symmetry informed analysis of monoclinic Li2Ni3P4O14 presented for future diffraction experiments. Magnetic long-range order below a temperature 14.5 K can be viewed as a two-dimensional trimerized antiferromagnet with Ni ions in two Wyckoff positions in the centrosymmetric magnetic space group P21/c. It permits the coupling to circular polarization in the primary x-ray beam, unlike the corresponding diffraction by an antiferromagnet characterized by anti-inversion and a linear magnetoelectric effect, e.g., historically significant chromium sesquioxide (Cr2O3) and Cu2(MoO4)(SeO3) (Lovesey & van der Laan, 2024). The space group is inferred from neutron Bragg diffraction patterns, without an allowance for permitted Dirac dipoles (anapoles) and quadrupoles (Chikara et al., 2025).