Experimental evidences of the shape-induced structural distortion of SrTiO3 single crystals from impurity Mn4+ ions electron paramagnetic resonance
Abstract
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 × a × 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.
Keywords
strontium titanate,
impurity,
electron paramagnetic resonance,
surface-induced effect,
paramagnetic probe
Supporting agencies: The reported study was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities, Nos. 3.9979.2017/8.9 (I.N.G.) and 3.7704.2017/4.6 (R.V.Y.), by the Program of the Presidium of RAS \Condensed Matter Physics and New Generation Materials" (V.A.T.) and by the Operational Programme \Research, Development and Education" financed by European Structural and Investment Funds and Czech Ministry of Education, Youth and Sports, project No. SOLID21 - CZ.02.1.01/0.0/0.0/16 019/0000760 (A.D.).
About the Authors
B. F. Gabbasov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
I. N. Gracheva
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
S. I. Nikitin
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
D. G. Zverev
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
A. Dejneka
Institute of Physics, ASCR
Czech Republic
Czech Republic
v.v.i. Na Slovance 2, 18221 Prague
V. A. Trepakov
Institute of Physics, ASCR; Ioffe Physical-Technical Institute, Russian Academy of Sciences
Czech Republic
Czech Republic
v.v.i. Na Slovance 2, 18221 Prague; 194021 St. Petersburg, Russia
R. V. Yusupov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya 18, Kazan 420008
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Review
For citations:
Gabbasov B.F., Gracheva I.N., Nikitin S.I., Zverev D.G., Dejneka A., Trepakov V.A., 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. 2018;20(2):18201 (9 pp.).
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