A case for resonant x-ray Bragg diffraction by a collinear antiferromagnet Li2Ni3P4O14
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arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911095425335296 |
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| author | Lovesey, Stephen W. |
| author_facet | Lovesey, Stephen W. |
| contents | 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). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05174 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A case for resonant x-ray Bragg diffraction by a collinear antiferromagnet Li2Ni3P4O14 Lovesey, Stephen W. Strongly Correlated Electrons 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). |
| title | A case for resonant x-ray Bragg diffraction by a collinear antiferromagnet Li2Ni3P4O14 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.05174 |