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Magnetodielectric detection of magnetic quadrupole order in Ba(TiO)Cu-4(PO4)(4) with Cu4O12 square cupolas

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author 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., Ronnow H. M., Kimura T.,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal NATURE COMMUNICATIONS
Volume (Issue) 7
Page(s) 13039
Title of proceedings NATURE COMMUNICATIONS
DOI 10.1038/ncomms13039

Open Access

URL https://infoscience.epfl.ch/record/222824?ln=en
Type of Open Access Repository (Green Open Access)

Abstract

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)Cu4(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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