Experimental evidences of the shape-induced structural distortion of SrTiO.sub.3./sub. single crystals from impurity Mn.sup.4+./sup. ions electron paramagnetic resonance

0511044 - FZÚ 2020 RIV RU eng J - Journal Article
Gabbasov, B. F. - Gracheva, I.N. - Nikitin, S. - Zverev, D.G. - Dejneka, Alexandr - Trepakov, Vladimír - Yusupov, R.V.
Experimental evidences of the shape-induced structural distortion of SrTiO₃ single crystals from impurity Mn⁴⁺ ions electron paramagnetic resonance.
Magnetic Resonance in Solids. Roč. 20, č. 2 (2018), s. 1-9, č. článku 18201. ISSN 2072-5981
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 : strontium titanate * impurity * electron paramagnetic resonance * surface-induced effect * paramagnetic probe
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Method of publishing: Open access

A study of high-quality SrTiO3 single crystals doped with the Mn4+ ions in the cubic phase (T > 105 K) with X-band electron paramagnetic resonance reveals direct correspondence between a shape of a sample and magnetic anisotropy of the impurity Mn4+ centers. In particular, for a sample with the shape of a square base rectangular prism, a size of (a x a x h) and faces perpendicular to the 100 crystallographic directions, zero-field splitting parameter D is approximately proportional to (a/h - 1) quantity. Temperature dependence of D indicates that this peculiar symmetry lowering is a feature characteristic for the cubic Fm3m phase of the strontium titanate. Diminishing of the D value with the decrease of the surface roughness for a thin (001)-oriented SrTiO3:Mn platelet shows that the observed effect originates from the sample surface.
Permanent Link: http://hdl.handle.net/11104/0301393