Dynamical moment fragmentation in the all-in all-out pyrochlore Nd2Sn2O7
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913086448861184 |
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| author | Luo, Yi Powell, Matthew S. Paddison, Joseph A. M. Ortiz, Brenden R. Stewart, J. Ross Kolis, Joseph W. Aczel, Adam A. |
| author_facet | Luo, Yi Powell, Matthew S. Paddison, Joseph A. M. Ortiz, Brenden R. Stewart, J. Ross Kolis, Joseph W. Aczel, Adam A. |
| contents | We report single-crystal neutron spectroscopy and bulk characterization on hydrothermally grown Nd2Sn2O7, revealing a dynamical moment fragmentation embedded within the all-in-all-out ordered state. The spectra show a nearly flat band with pinch-point-like momentum dependence, accompanied by dispersive branches that generate half-moon features across multiple Brillouin zones. These defining signatures are captured quantitatively by a minimal dipolar-octupolar spin Hamiltonian, demonstrating excellent agreement between experiment and theory. The higher flat-mode energy helps account for the absence of dynamical interference in prior muon spin relaxation (muSR) studies, while the lack of any photon-like excitation imposes strict constraints on the proposed Coulombic antiferromagnet scenario. Our results extend dynamical moment fragmentation to Nd2Sn2O7 and identify it as a clean, tractable platform for quantitative exploration of emergent gauge-field physics and multipolar spin-wave dynamics in frustrated magnets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_04845 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamical moment fragmentation in the all-in all-out pyrochlore Nd2Sn2O7 Luo, Yi Powell, Matthew S. Paddison, Joseph A. M. Ortiz, Brenden R. Stewart, J. Ross Kolis, Joseph W. Aczel, Adam A. Strongly Correlated Electrons We report single-crystal neutron spectroscopy and bulk characterization on hydrothermally grown Nd2Sn2O7, revealing a dynamical moment fragmentation embedded within the all-in-all-out ordered state. The spectra show a nearly flat band with pinch-point-like momentum dependence, accompanied by dispersive branches that generate half-moon features across multiple Brillouin zones. These defining signatures are captured quantitatively by a minimal dipolar-octupolar spin Hamiltonian, demonstrating excellent agreement between experiment and theory. The higher flat-mode energy helps account for the absence of dynamical interference in prior muon spin relaxation (muSR) studies, while the lack of any photon-like excitation imposes strict constraints on the proposed Coulombic antiferromagnet scenario. Our results extend dynamical moment fragmentation to Nd2Sn2O7 and identify it as a clean, tractable platform for quantitative exploration of emergent gauge-field physics and multipolar spin-wave dynamics in frustrated magnets. |
| title | Dynamical moment fragmentation in the all-in all-out pyrochlore Nd2Sn2O7 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.04845 |