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DOI	10.1073/pnas.1908956116
	Raman interrogation of the ferroelectric phase transition in polar metal LiOsO3
	Jin F.; Wang L.; Zhang A.; Ji J.; Shi Y.; Wang X.; Yu R.; Zhang J.; Plummer E.W.; Zhang Q.
发表日期	2019
ISSN	0027-8424
起始页码	20322
结束页码	20327
卷号	116 期号:41
英文摘要	Ferroelectric (FE) distortions in a metallic material were believed to be experimentally inaccessible because itinerant electrons would screen the long-range Coulomb interactions that favor a polar structure. It has been suggested by Anderson and Blount [P. W. Anderson, E. I. Blount, Phys. Rev. Lett. 14, 217−219 (1965)] that a transition from paraelectric phase to FE phase is possible for a metal if, in the paraelectric phase, the electrons at the Fermi level are decoupled from the soft transverse optical phonons, which lead to ferroelectricity. Here, using Raman spectroscopy combined with magnetotransport measurements on a recently discovered FE metal LiOsO3, we demonstrate active interplay of itinerant electrons and the FE order: Itinerant electrons cause strong renormalization of the FE order parameter, leading to a more gradual transition in LiOsO3 than typical insulating FEs. In return, the FE order enhances the anisotropy of charge transport between parallel and perpendicular to the polarization direction. The temperature-dependent evolution of Raman active in-plane 3Eg phonon, which strongly couples to the polar-active out-of-the-plane A2u phonon mode in the high-temperature paraelectric state, exhibits a deviation in Raman shift from the expectation of the pseudospin−phonon model that is widely used to model many insulating FEs. The Curie−Weiss temperature (θ ≈ 97 K) obtained from the optical susceptibility is substantially lower than Ts, suggesting a strong suppression of FE fluctuations. Both line width and Fano line shape of 3Eg Raman mode exhibit a strong electron− phonon coupling in the high-temperature paraelectric phase, which disappears in the FE phase, challenging Anderson/Blount’s proposal for the formation of FE metals. © 2019 National Academy of Sciences. All rights reserved.
英文关键词	Ferroelectric phase transition; Itinerant electrons; Polar metal; Raman
语种	英语
scopus关键词	anisotropy; article; electron; expectation; high temperature; phase transition; phonon; polarization; Raman spectrometry
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160342
作者单位	Jin, F., Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China, Department of Physics, Renmin University of China, Beijing, 100872, China; Wang, L., Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Zhang, A., School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China; Ji, J., Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Shi, Y., Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Wang, X., Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China; Yu, R., Department of Physics, Renmin University of China, Beijing, 100872, China; Zhang, J., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA ...
推荐引用方式 GB/T 7714	Jin F.,Wang L.,Zhang A.,et al. Raman interrogation of the ferroelectric phase transition in polar metal LiOsO3[J],2019,116(41).
APA	Jin F..,Wang L..,Zhang A..,Ji J..,Shi Y..,...&Zhang Q..(2019).Raman interrogation of the ferroelectric phase transition in polar metal LiOsO3.Proceedings of the National Academy of Sciences of the United States of America,116(41).
MLA	Jin F.,et al."Raman interrogation of the ferroelectric phase transition in polar metal LiOsO3".Proceedings of the National Academy of Sciences of the United States of America 116.41(2019).