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Effect of oxygen content variations on structural and magnetic features in La_0.5Sr_0.5FeO_3-δ

Russian version

Dmitriev A. I.

¹, Zaitsev S. V.

², Dmitrieva M. S.

¹, Rybchenko O. G.

², Sedykh V. D.

¹Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
²Osipyan Institute of Solid State Physics RAS, Chernogolovka, Russia

Email: alex-dmitriev2005@yandex.ru, szaitsev@issp.ac.ru, maiyasnig@yandex.ru, orybch@issp.ac.ru, sedykh@issp.ac.ru

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Abstract
References
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The dependences of the magnetic moment on the temperature M(T) and the magnetic field strength M(H) of polycrystalline samples La_0.5Sr_0.5FeO_3-δ before and after vacuum annealing are studied in detail. Four critical temperatures are visible on the curves M(T) of the sample before annealing. The temperature T_1=T_N~ 230 K corresponds to the Neel temperature of the compound La_0.5Sr_0.5FeO_3-δ, at which a weak "parasitic" ferromagnetism is established in the sample. The temperature T_2=T_V~ 195 K corresponds to the Vervey temperature, below which the localization of charge carriers occurs in the sample. The temperature range from T_3~ 170 K to T_4~ 80 K apparently corresponds to the formation of a frustrated spin glass state in the sample. Vacuum annealing leads to a noticeable increase in the Neel temperature T_N. The magnetometry data are also confirmed by the data of Mossbauer and Raman spectroscopy. Keywords: orthoferrites, canted antiferromagnetism, vacuum annealing.

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