Breaking of the Cubic Symmetry in Millimeter-Size SrTiO3 Crystals: ESR Manifestations

B. F. Gabbasov; Габбасов Б. Ф.; I. N. Gracheva; Грачева И. Н.; S. I. Nikitin; Никитин С. И.; V. A. Trepakov; Трепаков В. А.; R. V. Yusupov; Юсупов Р. В.

doi:10.31857/S0023476123600556

Breaking of the Cubic Symmetry in Millimeter-Size SrTiO3 Crystals: ESR Manifestations

作者: Gabbasov B.F.¹, Gracheva I.N.¹, Nikitin S.I.¹, Trepakov V.A.², Yusupov R.V.¹
隶属关系:
1. Kazan Federal University, 420008, Kazan, Russia
2. Ioffe Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia
期: 卷 68, 编号 5 (2023)
页面: 709-721
栏目: REAL STRUCTURE OF CRYSTALS
URL: https://kld-journal.fedlab.ru/0023-4761/article/view/673342
DOI: https://doi.org/10.31857/S0023476123600556
EDN: https://elibrary.ru/DOJDMV
ID: 673342

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详细

The found effect of lowering the symmetry of the crystal structure of thin (less than 1 mm) plates and bars of strontium titanate (SrTiO3) single crystals is discussed. This symmetry lowering manifests itself in the electron spin resonance (ESR) spectra of impurity centers (Fe³⁺ and Mn⁴⁺ ions, used as paramagnetic probes). It is shown that symmetry lowering is observed at temperatures T > 105 K, which generally correspond to the cubic phase of SrTiO3; it leads to the formation of a tetragonal nonpolar structure, differing from the antiferrodistortive (AFD) phase D4ℎ18, which is characteristic of strontium titanate at T < 105 K and was not observed previously in SrTiO3. The factors determining the distortion value are found to be the geometry and ratio of sample sizes, surface finishing quality, and crystallographic orientation of plates.

参考

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