danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"dan-403Research ArticleФИЗИКАPHYSICSМАГНИТНЫЕ ФАЗОВЫЕ ПРЕВРАЩЕНИЯ В ПЕРОВСКИТАХ La1–x Srx Mn0,5Ni0,5O3 (0 ≤ x ≤ 0,2)MAGNETIC PHASE TRANSITIONS IN La1–xSrx Mn0.5Ni0.5O3 (0 ≤ x ≤ 0.2) PEROVSKITESТроянчукИ. О.TroyanchukI. O.

член-корреспондент, д-р физ.-мат. наук, профессор, заведующий лабораторией

Corresponding Member, D. Sc. (Physics and Mathematics), Professor, Head of the Laboratory, Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus

troyan@physics.byБушинскийМ. В.BushinskyM. V.

канд. физ.-мат. наук, ст. науч. сотрудник

Ph. D. (Physics and Mathematics), Senior researcher, Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus

byshinsky@physics.byЧоботГ. М.ChobotG. M.

канд. физ.-мат. наук, доцент

Ph. D. (Physics and Mathematics), Assistant Professor

g.m.chobot@tut.byНикитинА. В.NikitinA. V.

мл. науч. сотрудник

Junior researcher, Scientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus

shyrik_n@tut.byНПЦ НАН Беларуси по материаловедению, МинскScientific and Practical Materials Research Centre of the National Academy of Sciences of Belarus, MinskБелорусский государственный аграрный технический университет, МинскBelarusian State Agrarian Technical University2017280420176122531Copyright © Троянчук И.О., Бушинский М.В., Чобот Г.М., Никитин А.В., 20172017Троянчук И.О., Бушинский М.В., Чобот Г.М., Никитин А.В.Troyanchuk I.O., Bushinsky M.V., Chobot G.M., Nikitin A.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/403

Перовскиты La1–x Srx Ni0,5Mn0,5O3 (0 ≤ x ≤ 0,2) были исследованы методами дифракции нейтронов, измерения намагниченности и магниторезистивного эффекта. Показано, что ионы никеля и марганца частично упорядочены во всех составах, несмотря на замещение ионов La3+ на Sr2+ и повышение средней валентности ионов никеля. Магнитная структура изменяется от ферромагнитной (х = 0) к антиферромагнитной (х ≥ 0,1), однако температура перехода в парамагнитное состояние не меняется. Магнитосопротивление в ферромагнитной фазе большое и уменьшается с ростом температуры и увеличением отношения Ni3+/Ni2+. Результаты обсуждаются в модели, согласно которой ферро- магнитная и антиферромагнитная части обменных взаимодействий Ni2+–O–Mn4+ близки по величине, тогда как для Ni3+–O–Mn4+ сверхобменное взаимодействие антиферромагнитно.

 

The La1–x Srx Ni0

The La1–x Srx Ni0.5Mn0.5O3 (0 ≤ x ≤ 0.2) perovskites have been studied by the methods of neutron powder diffraction and magnetization and by magnetoresistance measurement. It was shown that Ni and Mn ions are partially ordered in spite of the presence of Ni3+ ions arising from La3+ with Sr2+ substitution. The magnetic structure changes from ferromagnetic (x = 0) to antiferromagnetic (x ≥ 0.1); however, the transition temperature into the paramagnetic state is constant. Magnetoresistance in the ferromagnetic phase is large and gradually decreases with increasing temperature and Sr2+ content. The results are discussed in terms of close in value ferromagnetic and antiferromagnetic parts of Ni2+–O–Mn4+ magnetic interactions and the enforcement of 3d-O2p orbital hybridization in the magnetic field.

 

 

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The authors declare that there are no conflicts of interest present.