Magnetodielectric detection of magnetic quadrupole order in Ba(TiO)Cu$_4$(PO$_4$)$_4$ with Cu$_4$O$_{12}$ square cupolas
| Autor: | Kimura, K., Babkevich, P., Sera, M., Toyoda, M., Yamauchi, K., Tucker, G. S., Martius, J., Fennell, T., Manuel, P., Khalyavin, D. D., Johnson, R. D., Nakano, T., Nozue, Y., Rønnow, H. M., Kimura, T. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Nature Communications 7, 13039 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/ncomms13039 |
| Popis: | 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$_4$(PO$_4$)$_4$. The present result serves as a useful guide for exploring and designing new ME-active materials based on vortex-like spin arrangements. Comment: 4 figures |
| Databáze: | arXiv |
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