期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms13039
关键词
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资金
- Science and Technology Facilities Council
- JSPS KAKENHI [26610103, 16K05449, 26800186, 24244058]
- European Research Council
- CONQUEST
- Swiss National Science Foundation
- Grants-in-Aid for Scientific Research [15KK0165, 26400334, 26800186, 16K05449, 26610103, 26287070] Funding Source: KAKEN
In vortex-like spin arrangements, multiple spins can combine into emergent multipole moments. Such multipole moments have broken space-inversion and time-reversal symmetries, and can therefore exhibit linear magnetoelectric (ME) activity. Three types of such multipole moments are known: toroidal; monopole; and quadrupole moments. So far, however, the ME activity of these multipole moments has only been established experimentally for the toroidal moment. Here we propose a magnetic square cupola cluster, in which four corner-sharing square-coordinated metal-ligand fragments form a noncoplanar buckled structure, as a promising structural unit that carries an ME-active multipole moment. We substantiate this idea by observing clear magnetodielectric signals associated with an antiferroic ME-active magnetic quadrupole order in the real material Ba(TiO)Cu-4(PO4)(4). The present result serves as a useful guide for exploring and designing new ME-active materials based on vortex-like spin arrangements.
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