OBSERVATION OF GRIFFITHS PHASE IN OXYGEN DEFICIENT La0.70Sr0.30MnO3-g BY ELECTRON MAGNETIC RESONANCE
Abstract
The oxygen deficient polycrystalline La0.70Sr0.30MnO3-g (0 < g £ 0.2) manganites were studied by means of electron magnetic resonance (EMR). The EMR spectra give evidence for an unusual and g-dependent transition between the ferromagnetic and paramagnetic phases of the manganites. A Griffiths phase (revealed as coexisting ferromagnetic and paramagnetic signals far above the magnetic ordering temperature) was observed in the samples with 0.1 £ g £ 0.2. The formation of this phase, characterized by the existence of ferromagnetic clusters in the paramagnetic matrix, is caused by oxygen deficiency which hampers the realization of long-range ferromagnetic ordering of manganese ions.
About the Authors
S. V. Adashkevich
Belarusian State University
Russian Federation
Russian Federation
S. A. Markevich
Scientific-Practical Material Research Centre, National Academy of Sciences of Belarus
Russian Federation
Russian Federation
S. V. Trukhanov
Scientific-Practical Material Research Centre, National Academy of Sciences of Belarus
Russian Federation
Russian Federation
R. . Fedaruk
Institute of Physics, University of Szczecin
Russian Federation
Russian Federation
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Review
For citations:
Adashkevich S.V., Markevich S.A., Trukhanov S.V., Fedaruk R. OBSERVATION OF GRIFFITHS PHASE IN OXYGEN DEFICIENT La0.70Sr0.30MnO3-g BY ELECTRON MAGNETIC RESONANCE. Zhurnal Prikladnoii Spektroskopii. 2017;84(4):664-667. (In Russ.)
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