Dielectric Response of Quantum Critical Ferroelectric as a Function of Pressure.

Coak, M. J. and Haines, C. R. S. and Liu, C. and Jarvis, D. M. and Littlewood, P. B. and Saxena, S. S. (2018) Dielectric Response of Quantum Critical Ferroelectric as a Function of Pressure. Scientific Reports, 8. p. 14936. ISSN 2045-2322, ESSN: 2045-2322 DOI https://doi.org/10.1038/s41598-018-33320-2

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In this work we report for the first time measurements of the dielectric loss of single-crystal SrTiO3 under the application of hydrostatic pressure up to 20 kbar and temperatures down to 200 mK which allow us to comment on the evolution of new fundamental material properties and their relationship with the recently discovered quantum critical phenomena in this material. The well known 18 K peak or shoulder was no longer observed after pressure was applied, even after subsequently removing it, suggesting it is associated with the twin walls formed at the 110 K cubic-tetragonal transition. The family of familiar peaks were all seen to increase in temperature linearly with pressure and the height of the 9.4 K peak was drastically suppressed by even the smallest pressures. This peak is discussed in the context of a postulated ferroelectric quantum critical point in SrTiO3 and the behaviour of its size linked to the position of this point on the recently established phase diagram.

Item Type: Article
Uncontrolled Keywords: NILAREP; IA73
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 8
Page Range: p. 14936
Identification Number: https://doi.org/10.1038/s41598-018-33320-2
Depositing User: Sarah Humbert
Date Deposited: 07 Jan 2019 15:58
Last Modified: 07 Jan 2019 16:14
URI: http://eprints.esc.cam.ac.uk/id/eprint/4387

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