Metals cannot exhibit ferroelectricity because static internal electric fields are screened by conduction electrons1, but in 1965, Anderson and Blount predicted the possibility of a ferroelectric metal, in which a ferroelectric-like structural transition occurs in the metallic state2. Up to now, no clear example of such a material has been identified. Here we report on a centrosymmetric () to non-centrosymmetric (R3c) transition in metallic LiOsO3 that is structurally equivalent to the ferroelectric transition of LiNbO3 (ref. 3). The transition involves a continuous shift in the mean position of Li+ ions on cooling below 140 K. Its discovery realizes the scenario described in ref. 2, and establishes a new class of materials whose properties may differ from those of normal metals.
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We thank M. Miyakawa (NIMS) for the high-pressure synthesis experiment, H. X. Yang (CAS) and J. Q. Li (CAS) for the ED study, S. Takenouchi (NIMS) for the AAS, and A. Aimi (Gakushuin Univ.), M. Tachibana (NIMS) and M. Terauchi (Tohoku Univ.) for discussion and suggestions. This research was supported in part by the World Premier International Research Center from MEXT, Japan; a Grant-in-Aid for Scientific Research (22246083 and 25289233) from JSPS, Japan; the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program) from JSPS, Japan; the Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST), Japan; the 973 project of the Ministry of Science and Technology of China (No. 2011CB921701 and 2011CBA00110), China; and the United Kingdom Engineering and Physical Sciences Research Council (EPSRC).
The authors declare no competing financial interests.
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Shi, Y., Guo, Y., Wang, X. et al. A ferroelectric-like structural transition in a metal. Nature Mater 12, 1024–1027 (2013). https://doi.org/10.1038/nmat3754
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