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Journal Article

Multiferroic properties of melanothallite Cu2OCl2

MPS-Authors
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Guo,  H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons186103

Zhao,  L.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons135846

Becker,  Ch.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons243645

Melendez-Sans,  A.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Peng,  W.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons241954

Hansmann,  P.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126701

Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Guo, H., Zhao, L., Schmidt, W., Fernández-Díaz, M. T., Becker, C., Melendez-Sans, A., et al. (2019). Multiferroic properties of melanothallite Cu2OCl2. Physical Review Materials, 3(12): 124405, pp. 1-8. doi:10.1103/PhysRevMaterials.3.124405.


Cite as: https://hdl.handle.net/21.11116/0000-0005-6CFB-8
Abstract
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.