Neutron scattering from local magnetoelectric multipoles: a combined theoretical, computational, and experimental perspective
| Autor: | Urru, Andrea, Soh, Jian-Rui, Qureshi, Navid, Stunault, Anne, Roessli, Bertrand, Rønnow, Henrik M., Spaldin, Nicola A. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 5, 033147 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.5.033147 |
| Popis: | 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. Comment: 17 pages, 8 figures |
| Databáze: | arXiv |
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