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  Oxyhalides: A new class of high-TC multiferroic materials

Zhao, L., Fernández-Díaz, M. T., Tjeng, L. H., & Komarek, A. C. (2016). Oxyhalides: A new class of high-TC multiferroic materials. Science Advances, 2(5): e1600353, pp. 1-5. doi:10.1126/sciadv.1600353.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F3D0-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D59C-C
Genre: Journal Article

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 Creators:
Zhao, Li1, Author              
Fernández-Díaz, Maria Teresa2, Author
Tjeng, Liu Hao3, Author              
Komarek, Alexander C.4, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2External Organizations, ou_persistent22              
3Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
4Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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 Abstract: Magnetoelectric multiferroics have attracted enormous attention in the past years because of their high potential for applications in electronic devices, which arises from the intrinsic coupling between magnetic and ferroelectric ordering parameters. The initial finding in TbMnO3 has triggered the search for other multiferroics with higher ordering temperatures and strong magnetoelectric coupling for applications. To date, spin-driven multiferroicity is found mainly in oxides, as well as in a few halogenides. We report multiferroic properties for synthetic melanothallite Cu2OCl2, which is the first discovery of multiferroicity in a transition metal oxyhalide. Measurements of pyrocurrent and the dielectric constant in Cu2OCl2 reveal ferroelectricity below the Néel temperature of ~70 K. Thus, melanothallite belongs to a new class of multiferroic materials with an exceptionally high critical temperature. Powder neutron diffraction measurements reveal an incommensurate magnetic structure below TN, and all magnetic reflections can be indexed with a propagation vector [0.827(7), 0, 0], thus discarding the claimed pyrochlore-like “}all-in{–}all-out{” spin structure for Cu2OCl2, and indicating that this transition metal oxyhalide is, indeed, a spin-induced multiferroic material.

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Language(s): eng - English
 Dates: 2016-05-272016-05-27
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1126/sciadv.1600353
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 2 (5) Sequence Number: e1600353 Start / End Page: 1 - 5 Identifier: Other: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548