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Uniaxial ferroelectric quantum criticality in multiferroic hexaferrites BaFe12O19 and SrFe12O19

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srep25724_CC.pdf (541.1Kb)
Date
17/05/2016
Author
Rowley, S. E.
Chai, Yi-Sheng
Shen, Shi-Peng
Sun, Young
Jones, A. T.
Watts, B. E.
Scott, James Floyd
Keywords
Ferroelectrics and multiferroics
Information storage
Phase transitions and critical phenomena
QC Physics
QD Chemistry
NDAS
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Abstract
BaFe12O19 is a popular M-type hexaferrite with a Néel temperature of 720 K and is of enormous commercial value ($3 billion/year). It is an incipient ferroelectric with an expected ferroelectric phase transition extrapolated to lie at 6 K but suppressed due to quantum fluctuations. The theory of quantum criticality for such uniaxial ferroelectrics predicts that the temperature dependence of the electric susceptibility χ diverges as 1/T3, in contrast to the 1/T2 dependence found in pseudo-cubic materials such as SrTiO3 or KTaO3. In this paper we present evidence of the susceptibility varying as 1/T3, i.e. with a critical exponent γ = 3. In general γ = (d + z – 2)/z, where the dynamical exponent for a ferroelectric z = 1 and the dimension is increased by 1 from deff = 3 + z to deff = 4 + z due to the effect of long-range dipole interactions in uniaxial as opposed to multiaxial ferroelectrics. The electric susceptibility of the incipient ferroelectric SrFe12O19, which is slightly further from the quantum phase transition is also found to vary as 1/T3.
Citation
Rowley , S E , Chai , Y-S , Shen , S-P , Sun , Y , Jones , A T , Watts , B E & Scott , J F 2016 , ' Uniaxial ferroelectric quantum criticality in multiferroic hexaferrites BaFe 12 O 19 and SrFe 12 O 19 ' , Scientific Reports , vol. 6 , 25724 . https://doi.org/10.1038/srep25724
Publication
Scientific Reports
Status
Peer reviewed
DOI
https://doi.org/10.1038/srep25724
ISSN
2045-2322
Type
Journal article
Rights
Copyright © 2016, Rights Managed by Nature Publishing Group This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8841

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