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High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange
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Jones, S. P. P., Gaw, Stephen M., Doig, K. I., Prabhakaran, Dharmalingam, Hétroy Wheeler, E. M., Boothroyd, Andrew T. and Lloyd-Hughes, James (2014) High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange. Nature Communications, Volume 5 . Article number: 3787. doi:10.1038/ncomms4787 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/ncomms4787
Abstract
Magnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation—the electromagnon—at terahertz frequencies, with spectral signatures that unveil important spin interactions. To date, electromagnons have been discovered at low temperature (<70 K) and predominantly in rare-earth compounds such as RMnO3. Here we demonstrate using terahertz time-domain spectroscopy that intersublattice exchange in the improper multiferroic cupric oxide (CuO) creates electromagnons at substantially elevated temperatures (213–230 K). Dynamic magnetoelectric coupling can therefore be achieved in materials, such as CuO, that exhibit minimal static cross-coupling. The electromagnon strength and energy track the static polarization, highlighting the importance of the underlying cycloidal spin structure. Polarized neutron scattering and terahertz spectroscopy identify a magnon in the antiferromagnetic ground state, with a temperature dependence that suggests a significant role for biquadratic exchange.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Copper compounds -- Magnetic properties | ||||||||
Journal or Publication Title: | Nature Communications | ||||||||
Publisher: | Nature Publishing Group | ||||||||
ISSN: | 2041-1723 | ||||||||
Official Date: | 29 April 2014 | ||||||||
Dates: |
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Volume: | Volume 5 | ||||||||
Article Number: | Article number: 3787 | ||||||||
DOI: | 10.1038/ncomms4787 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
Open Access Version: |
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