Title: Dielectric Response of Quantum Critical Ferroelectric as a Function of Pressure

Journal Article · · Scientific Reports
ORCiD logo [1]; ORCiD logo [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Cambridge Univ., Cambridge (United Kingdom); Institute for Basic Science, Seoul (Republic of Korea); Seoul National Univ., Seoul (Republic of Korea)
  2. Cambridge Univ., Cambridge (United Kingdom)
  3. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, Chicago, IL (United States)
  4. Cambridge Univ., Cambridge (United Kingdom); National Univ. of Science and Technology "MISiS", Moscow (Russia)
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In this study 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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Ministry of Education and Science of the Russian Federation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1487131
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate journal February 2019
Quantum critical phenomena in a compressible displacive ferroelectric journal May 2020
Pressure dependence of ferroelectric quantum critical fluctuations journal December 2019
Quantum critical phenomena in a compressible displacive ferroelectric text January 2020
Quantum Critical Phenomena in a Compressible Displacive Ferroelectric text January 2018
Pressure dependence of ferroelectric quantum critical fluctuations text January 2019

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