0392281 - FZÚ 2014 RIV US eng J - Journal Article
Weerasinghe, J. - Bellaiche, L. - Ostapchuk, Tetyana - Kužel, Petr - Kadlec, Christelle - Lisenkov, S. - Ponomareva, I. - Hlinka, Jiří
Emergence of central mode in the paraelectric phase of ferroelectric perovskites.
MRS Communications. Roč. 3, č. 1 (2013), s. 41-45. ISSN 2159-6859. E-ISSN 2159-6867
R&D Projects: GA MŠMT ME08109; GA ČR GAP204/10/0616
Institutional support: RVO:68378271
Keywords : soft mode * central mode * dielectric spectroscopy * molecular dynamics simulations
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.553, year: 2013

THz-range dielectric spectroscopy and first-principle-basede effective-Hamiltonian molecular dynamics simulations were employed to elucidate the dielectric response in the paraelectric phase of(Ba,Sr)TiO3 solid solutions. Our analysis suggests a crossover between two regimes a higher-temperature regime goverened by the soft-mode only versus a lower-temperature regime exhibiting a coupled soft mode/central mode dynamics.
Permanent Link: http://hdl.handle.net/11104/0221190