Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub>
A quantum paraelectric SrTiO<sub>3</sub> is a material situated in close proximity to a quantum critical point (QCP) of ferroelectric transition in which the critical temperature to the ferroelectric state is suppressed down to 0 K. However, the understanding of the behavior of the phase...
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MDPI AG
2021-11-01
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| author | Ekaterina D. Linnik Alexey S. Mikheykin Diego Rubi Vladimir B. Shirokov Daoud Mezzane Svitlana V. Kondovych Igor A. Lukyanchuk Anna G. Razumnaya |
| author_facet | Ekaterina D. Linnik Alexey S. Mikheykin Diego Rubi Vladimir B. Shirokov Daoud Mezzane Svitlana V. Kondovych Igor A. Lukyanchuk Anna G. Razumnaya |
| author_sort | Ekaterina D. Linnik |
| collection | DOAJ |
| description | A quantum paraelectric SrTiO<sub>3</sub> is a material situated in close proximity to a quantum critical point (QCP) of ferroelectric transition in which the critical temperature to the ferroelectric state is suppressed down to 0 K. However, the understanding of the behavior of the phase transition in the vicinity of this point remains challenging. Using the concentration x of Pb in solid solution Sr<sub>1−<i>x</i></sub>Pb<i><sub>x</sub></i>TiO<sub>3</sub> (PST<i>x</i>) as a tuning parameter and applying the combination of Raman and dielectric spectroscopy methods, we approach the QCP in PST<i>x</i> and study the interplay of classical and quantum phenomena in the region of criticality. We obtain the critical temperature of PST<i>x</i> and the evolution of the temperature-dependent dynamical properties of the system as a function of x to reveal the mechanism of the transition. We show that the ferroelectric transition occurs gradually through the emergence of the polar nanoregions inside the non-polar tetragonal phase with their further expansion on cooling. We also study the ferroelastic cubic-to-tetragonal structural transition, occurring at higher temperatures, and show that its properties are almost concentration-independent and not affected by the quantum criticality. |
| first_indexed | 2024-03-10T04:21:40Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T04:21:40Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-25c16a21afbd4e16afeb9f23dc01311c2023-11-23T07:48:09ZengMDPI AGCrystals2073-43522021-11-011112146910.3390/cryst11121469Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub>Ekaterina D. Linnik0Alexey S. Mikheykin1Diego Rubi2Vladimir B. Shirokov3Daoud Mezzane4Svitlana V. Kondovych5Igor A. Lukyanchuk6Anna G. Razumnaya7Faculty of Physics, Southern Federal University, 344090 Rostov-on-Don, RussiaFaculty of Physics, Southern Federal University, 344090 Rostov-on-Don, RussiaInstituto de Nanociencia y Nanotecnología, CONICET-CNEA, San Martín 1650, ArgentinaSouthern Scientific Center of Russian Academy of Science, 344006 Rostov-on-Don, RussiaLaboratoire de Physique de la Matière Condensée, Université de Picardie Jules Verne, 80080 Amiens, FranceLaboratoire de Physique de la Matière Condensée, Université de Picardie Jules Verne, 80080 Amiens, FranceFaculty of Physics, Southern Federal University, 344090 Rostov-on-Don, RussiaFaculty of Physics, Southern Federal University, 344090 Rostov-on-Don, RussiaA quantum paraelectric SrTiO<sub>3</sub> is a material situated in close proximity to a quantum critical point (QCP) of ferroelectric transition in which the critical temperature to the ferroelectric state is suppressed down to 0 K. However, the understanding of the behavior of the phase transition in the vicinity of this point remains challenging. Using the concentration x of Pb in solid solution Sr<sub>1−<i>x</i></sub>Pb<i><sub>x</sub></i>TiO<sub>3</sub> (PST<i>x</i>) as a tuning parameter and applying the combination of Raman and dielectric spectroscopy methods, we approach the QCP in PST<i>x</i> and study the interplay of classical and quantum phenomena in the region of criticality. We obtain the critical temperature of PST<i>x</i> and the evolution of the temperature-dependent dynamical properties of the system as a function of x to reveal the mechanism of the transition. We show that the ferroelectric transition occurs gradually through the emergence of the polar nanoregions inside the non-polar tetragonal phase with their further expansion on cooling. We also study the ferroelastic cubic-to-tetragonal structural transition, occurring at higher temperatures, and show that its properties are almost concentration-independent and not affected by the quantum criticality.https://www.mdpi.com/2073-4352/11/12/1469quantum paraelectricsstrontium titanatesolid solutionslattice dynamicsdielectric response |
| spellingShingle | Ekaterina D. Linnik Alexey S. Mikheykin Diego Rubi Vladimir B. Shirokov Daoud Mezzane Svitlana V. Kondovych Igor A. Lukyanchuk Anna G. Razumnaya Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> Crystals quantum paraelectrics strontium titanate solid solutions lattice dynamics dielectric response |
| title | Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> |
| title_full | Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> |
| title_fullStr | Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> |
| title_full_unstemmed | Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> |
| title_short | Raman Response of Quantum Critical Ferroelectric Pb-Doped SrTiO<sub>3</sub> |
| title_sort | raman response of quantum critical ferroelectric pb doped srtio sub 3 sub |
| topic | quantum paraelectrics strontium titanate solid solutions lattice dynamics dielectric response |
| url | https://www.mdpi.com/2073-4352/11/12/1469 |
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