Symmetry breaking in single-crystal SrTiO.sub.3./sub. plates: EPR manifestations

0552095 - FZÚ 2022 RIV FR eng J - Journal Article
Gabbasov, B. F. - Gracheva, I.N. - Rodionov, A.A. - Khamov, A.G. - Nikitin, S.I. - Zverev, D.G. - Trepakov, V.A. - Dejneka, Alexandr - Jastrabík, Lubomír - Yusupov, R.V.
Symmetry breaking in single-crystal SrTiO₃ plates: EPR manifestations.
EPL. Roč. 133, č. 3 (2021), č. článku 37002. ISSN 0295-5075. E-ISSN 1286-4854
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : electron paramagnetic resonance * SrTiO₃
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.958, year: 2021
Method of publishing: Limited access
https://doi.org/10.1209/0295-5075/133/37002

Results of the electron paramagnetic resonance (EPR) studies of Fe3+ and Mn4+ impurity centers in high-quality single-crystal SrTiO3 plates with thickness $h < 1 ext{mm}$ are presented. Impurities served the paramagnetic probes of the crystal structure. Analysis of the collected data indicates that the symmetry of the crystal structure of thin (001) and (110) oriented strontium titanate plates above $105 ext{K}$ lowers in the bulk from the cubic to tetragonal. The structure of this high-temperature tetragonal state is different from that of the conventional low-temperature antiferrodistorsive phase and has not been reported for SrTiO3 before. It is shown that the effect does not originate from the residual stress its magnitude and particular manifestations depend on plate orientation, surface quality and geometry of a sample.
Permanent Link: http://hdl.handle.net/11104/0327248