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

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

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.

Авторлар туралы

B. Gabbasov

Kazan Federal University, 420008, Kazan, Russia

Email: BFGabbasov@kpfu.ru
Россия, Казань

I. Gracheva

Kazan Federal University, 420008, Kazan, Russia

Email: BFGabbasov@kpfu.ru
Россия, Казань

S. Nikitin

Kazan Federal University, 420008, Kazan, Russia

Email: BFGabbasov@kpfu.ru
Россия, Казань

V. Trepakov

Ioffe Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia

Email: BFGabbasov@kpfu.ru
Россия, Санкт-Петербург

R. Yusupov

Kazan Federal University, 420008, Kazan, Russia

Хат алмасуға жауапты Автор.
Email: BFGabbasov@kpfu.ru
Россия, Казань

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