气候变化领域集成服务门户(CCPortal): Quantum critical phenomena in a compressible displacive ferroelectric

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DOI	10.1073/pnas.1922151117
	Quantum critical phenomena in a compressible displacive ferroelectric
	Coak M.J.; Haines C.R.S.; Liu C.; Rowley S.E.; Lonzarich G.G.; Saxena S.S.
发表日期	2020
ISSN	0027-8424
起始页码	12707
结束页码	12712
卷号	117 期号:23
英文摘要	The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic materials have in many cases been found to initially increase with increasing thermal disorder and hence, exhibit peaks as a function of temperature. A quantitative description of these examples of “order-by-disorder” phenomena has remained elusive in nearly ferromagnetic metals and in dielectrics on the border of displacive ferroelectric transitions. Here, we present an experimental study of the evolution of the dielectric susceptibility peak as a function of pressure in the nearly ferroelectric material, strontium titanate, which reveals that the peak position collapses toward absolute zero as the ferroelectric quantum critical point is approached. We show that this behavior can be described in detail without the use of adjustable parameters in terms of the Larkin–Khmelnitskii–Shneerson–Rechester (LKSR) theory, first introduced nearly 50 y ago, of the hybridization of polar and acoustic modes in quantum paraelectrics, in contrast to alternative models that have been proposed. Our study allows us to construct a detailed temperature–pressure phase diagram of a material on the border of a ferroelectric quantum critical point comprising ferroelectric, quantum critical paraelectric, and hybridized polar-acoustic regimes. Furthermore, at the lowest temperatures, below the susceptibility maximum, we observe a regime characterized by a linear temperature dependence of the inverse susceptibility that differs sharply from the quartic temperature dependence predicted by the LKSR theory. We find that this non-LKSR low-temperature regime cannot be accounted for in terms of any detailed model reported in the literature, and its interpretation poses an empirical and conceptual challenge. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Ferroelectricity; High pressure; Quantum criticality
语种	英语
scopus关键词	strontium; strontium titanate; titanium derivative; unclassified drug; Article; chemical parameters; chemical phenomena; controlled study; electricity; experimental study; ferroelectricity; hybridization; hydrostatic pressure; Larkin Khmelnitskii Shneerson Rechester theory; low temperature; physical parameters; physical phenomena; priority journal; quantum critical point; superconductivity; temperature dependence; theoretical study
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/160285
作者单位	Coak, M.J., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom; Haines, C.R.S., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom; Liu, C., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom; Rowley, S.E., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom, Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, 22290-180, Brazil; Lonzarich, G.G., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom; Saxena, S.S., Cavendish Laboratory, Cambridge University, Cambridge, CB3 0HE, United Kingdom, National University of Science and Technology (NUST), “MISiS (Moscow Institute of Steel and Alloys), Moscow, 119049, Russian Federation
推荐引用方式 GB/T 7714	Coak M.J.,Haines C.R.S.,Liu C.,et al. Quantum critical phenomena in a compressible displacive ferroelectric[J],2020,117(23).
APA	Coak M.J.,Haines C.R.S.,Liu C.,Rowley S.E.,Lonzarich G.G.,&Saxena S.S..(2020).Quantum critical phenomena in a compressible displacive ferroelectric.Proceedings of the National Academy of Sciences of the United States of America,117(23).
MLA	Coak M.J.,et al."Quantum critical phenomena in a compressible displacive ferroelectric".Proceedings of the National Academy of Sciences of the United States of America 117.23(2020).