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024 7 _ |a 10.1103/PhysRevMaterials.3.124405
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100 1 _ |a Guo, H.
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245 _ _ |a Multiferroic properties of melanothallite Cu 2 OCl 2
260 _ _ |a College Park, MD
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520 _ _ |a Here we report on P−E hysteresis loop measurements that unravel the ferroelectric nature of melanothallite Cu2OCl2, a new multiferroic material with high critical temperature. Its spin structure was investigated by polarized and unpolarized neutron scattering experiments which reveal a cycloidal magnetic structure with vector chirality (magnetic polarity) that can be inverted by opposite poling of the sample with an inverted electric field. This shows that Cu2OCl2 is a spin-induced ferroelectric material. Finally, we show that the ferroelectric properties of Cu2OCl2 are driven by the inverse Dzyaloshinskii-Moriya interaction mechanism which is also able to predict the observed direction of the ferroelectric polarization properly. The origin of the noncollinear spin structure in melanothallite are competing AFM-FM exchange couplings which we estimate from a combined ab initio + cluster configuration interaction calculation.
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700 1 _ |a Zhao, L.
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700 1 _ |a Schmidt, W.
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700 1 _ |a Fernández-Díaz, M. T.
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700 1 _ |a Becker, Ch.
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700 1 _ |a Peng, W.
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700 1 _ |a Komarek, A. C.
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773 _ _ |a 10.1103/PhysRevMaterials.3.124405
|g Vol. 3, no. 12, p. 124405
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