Unusual dynamics of the ferroelectric phase transition in K.sub.1-x./sub.Li.sub.x./sub.TaO.sub.3./sub. crystals

0557953 - FZÚ 2023 RIV US eng J - Journal Article
Nuzhnyy, Dmitry - Bovtun, Viktor - Buixaderas, Elena - Petzelt, Jan - Savinov, Maxim - Kempa, Martin - Pasciak, Marek - Rafalovskyi, Iegor - Paingad, Vaisakh Chelod - Kužel, Petr - Kamba, Stanislav - Repček, Dalibor - Pashkin, A. - Trepakov, V. A. - Trybula, Z.
Unusual dynamics of the ferroelectric phase transition in K_1-xLi_xTaO₃ crystals.
Physical Review B. Roč. 105, č. 18 (2022), č. článku 184103. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA21-06802S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : broad-band dielectric spectroscopy * time-domain terahertz transmission * Li-doped KTaO₃ * Raman * effective medium approach
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Open access with time embargo
https://doi.org/10.1103/PhysRevB.105.184103

K1-xLixTaO3 (x = 0.043, 0.08) crystals, characterized by the pyroelectric current with calculated spontaneous polarization and zero-field second-harmonic generation, have been studied by broad-band dielectric spectroscopy including the time-domain terahertz transmission and infrared reflectivity and by the polarized Raman spectroscopy in the 10–300 K temperature range. This multi-experimental approach has proven the percolative nature of the ferroelectric transition at low temperatures and demonstrated that the ferroelectric phase is inherently inhomogeneous and displays coexistence of ferroelectric and relaxor regions.
Permanent Link: http://hdl.handle.net/11104/0331835