Symmetry breaking in single-crystal SrTiO3 plates: EPR manifestations

B. F. Gabbasov; I. N. Gracheva; A. A. Rodionov; A. G. Kiiamov; S. I. Nikitin; D. G. Zverev; V. A. Trepakov; A. Dejneka; L. Jastrabik; R. V. Yusupov

doi:10.1209/0295-5075/133/37002

All issues

Volume 133 / No 3 (February 2021)

EPL, 133 3 (2021) 37002

Abstract

Issue		EPL Volume 133, Number 3, February 2021


Article Number		37002
Number of page(s)		7
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/133/37002
Published online		24 March 2021

EPL, 133 (2021) 37002

Symmetry breaking in single-crystal SrTiO₃ plates: EPR manifestations

B. F. Gabbasov¹^(a), I. N. Gracheva¹, A. A. Rodionov¹, A. G. Kiiamov¹, S. I. Nikitin¹, D. G. Zverev¹, V. A. Trepakov², A. Dejneka³^(b), L. Jastrabik³ and R. V. Yusupov¹

¹ Kazan Federal University - Kremlyovskaya 18, 420008 Kazan, Russia
² Ioffe Physical- Technical Institute - Politekhnicheskaya 26, 194021 St. Petersburg, Russia
³ Institute of Physics - Na Slovance 2, 182 21 Prague, Czech Republic

^(a) bulgabbasov@gmail.com
^(b) dejneka@fzu.cz (corresponding author)

Received: 16 November 2020
Accepted: 3 January 2021

Abstract

Results of the electron paramagnetic resonance (EPR) studies of Fe³⁺ and Mn⁴⁺ impurity centers in high-quality single-crystal SrTiO₃ plates with thickness $h < 1\ \text{mm}$ 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 $105\ \text{K}$ 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. Peculiarities of the observed phenomenon are presented and the possible scenario of its realization is discussed.

PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 61.50.Ah – Theory of crystal structure, crystal symmetry; calculations and modeling / 77.84.Cg – PZT ceramics and other titanates

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