Local dynamics and phase transition in quantum paraelectric SrTiO3 studied by Ti K-edge x-ray absorption spectroscopy

0486080 - FZÚ 2018 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Anspoks, A. - Timoshenko, J. - Purans, J. - Rocca, F. - Trepakov, Vladimír - Dejneka, Alexandr - Itoh, M.
Local dynamics and phase transition in quantum paraelectric SrTiO3 studied by Ti K-edge x-ray absorption spectroscopy.
Journal of Physics Conference Series. Vol. 712. Bristol: IOP Publishing, 2016, s. 1-4, č. článku 012101. ISSN 1742-6588.
[International Conference on X-Ray Absorption Fine Structure /19./ - XAFS 2015. Karlsruhe (DE), 23.08.2015-28.08.2015]
Grant CEP: GA ČR GAP108/12/1941; GA MŠMT LO1409
Grant ostatní: SAFMAT(XE) CZ.2.16/3.1.00/22132
Institucionální podpora: RVO:68378271
Klíčová slova: strontium-titanate * exafs spectroscopy * low-temperature * fine-structure * ferroelectricity * perovskite * scattering * disorder * spectra
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Strontium titanate is a model quantum paraelectric in which, in the region of dominating quantum statistics, the ferroelectric instability is inhibited due to nearly complete compensation of the harmonic contribution into ferroelectric soft mode frequency by the zero-point motion contribution. The enhancement of atomic masses by the substitution of O-16 with O-18 decreases the zero-point atomic motion, and low-T ferroelectricity in (SrTiO3)-O-18 is realized. In this study we report on the local structure of Ti in (SrTiO3)-O-16 and (SrTiO3)-O-18 investigated by Extended X-ray Absorption Fine Structure measurements in the temperature range 6 300 K.
Trvalý link: http://hdl.handle.net/11104/0283295