globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1922151117
论文题名:
Quantum critical phenomena in a compressible displacive ferroelectric
作者: Coak M.J.; Haines C.R.S.; Liu C.; Rowley S.E.; Lonzarich G.G.; Saxena S.S.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:23
起始页码: 12707
结束页码: 12712
语种: 英语
英文关键词: Ferroelectricity ; High pressure ; Quantum criticality
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163460
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Coak M.J.,Haines C.R.S.,Liu C.,et al. Quantum critical phenomena in a compressible displacive ferroelectric[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(23)
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