Crystal structure, magnetic and elastic properties of Sr0,8Y0,2CoO2,65
https://doi.org/10.29235/1561-8323-2019-63-5-542-547
Abstract
Communicated by Corresponding Member Fedor P. Korshunov
A comprehensive study of the crystal structure, magnetic and elastic properties of layered cobaltite Sr0,8Y0,2CoO2,65 with a perovskite-type structure was carried out. It is established that the magnetic ordering in this composition is accompanied by a structural transition. The Neel temperature (TN) is 375 K. The unit cell volume at TN increases as a result of the orbital ordering in the CoO5 pyramids connected by the vertices in the anion-deficient layers. The main magnetic structure is an antiferromagnetic G-type structure with a small ferromagnetic component. The non-collinear magnetic structure is stabilized by the ferromagnetic bonds between the cobalt ions in the CoO5 pyramids. Co3+ ions in the both layers are in the mixed low-spin (LS)/high-spin (HS) state. The temperature dependence of the electrical resistivity has a semiconductor character. The large resistivity value and small magnetoresistance indicate a good stability of the semiconductor antiferromagnetic state of this composition.
Supporting agencies: The work is supported by the Belarusian Republican Foundation for Fundamental Research (Grant № Ф18Р-159)
About the Authors
Maxim V. Bushinsky
Scientific-Practical Materials Research Centre,National Academy of Sciences of Belarus
Russian Federation
Russian Federation
Bushinsky Maxim Vladislavovich - Ph. D. (Physics and Mathematics), Senior researcher.
19, P. Brovka Str., 220072, Minsk
Nina V. Tereshko
Scientific-Practical Materials Research Centre,National Academy of Sciences of Belarus
Russian Federation
Russian Federation
Tereshko Nina Viktorovna - Ph. D. (Physics and Mathematics), Researcher.
19, P. Brovka Str., 220072, Minsk
Alexandra N. Chobot
Scientific-Practical Materials Research Centre,National Academy of Sciences of Belarus
Russian Federation
Russian Federation
Chobot Aleksandra Nikolaevna - Ph. D. (Physics and Mathematics), Researcher.
19, P. Brovka Str., 220072, Minsk
Olga S. Mantytskaya
Scientific-Practical Materials Research Centre,National Academy of Sciences of Belarus
Russian Federation
Russian Federation
Mantytskaya Olga Stanislavovna - Ph. D. (Physics and Mathematics), Researcher.
19, P. Brovka Str., 220072, Minsk
Gennadii M. Chobot
Belarusian State Agrarian Technical University
Russian Federation
Russian Federation
Chobot Gennadii Mihailovich - Ph. D. (Physics and Mathematics), Assistant professor.
99, Nezavisimosti Ave., 220023, Minsk
Valeri M. Dobryansky
Belarusian State Agrarian Technical University
Russian Federation
Russian Federation
Dobryansky Valeri Mikhailovich - D. Sc. (Engineering), Professor.
99, Nezavisimosti Ave., 220023, Minsk
Sofija N. Pastushonok
Military Academy of the Republic of Belarus
Russian Federation
Russian Federation
Pastushonok Sofija Nikolaevna - Ph. D. (Physics and Mathematics), Assistant рrofessor.
220, Nezavisimosti Ave., 220057, Minsk
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