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Gabbasov, Bulat F; Gracheva, Irina N; Rodionov, Alexander A; Nikitin, Sergey I; Zverev, Dmitry G; Trepakov, Vladimir A; Dejneka, Alexandr; Jastrabik, Lubomir; Yusupov, Roman V
08/2020Journal Article
Electron paramagnetic resonance studies of the impurity Fe$^{3+}$ and Mn$^{4+}$ centers indicate that the symmetry of the crystal structure of millimeter-scale strontium titanate plates above 105 K lowers in the bulk from cubic to tetragonal, different from that of the conventional low-temperature antiferrodistortive phase. It is shown that the effect does not originate from the residual stress; its magnitude (observed tetragonal distortion) and particular manifestations depend on plate orientation, surface quality and the geometry of a sample. Peculiarities of the observed phenomenon are presented and possible scenario of its realization is discussed.
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