Abstract
Polycrystalline Sr0.8Dy0.2Co3 – δ complex cobalt oxides with a different amount of oxygen (δ = 0.26, 0.44, 0.46) have been prepared by solid-state synthesis. An increase in oxygen deficiency causes the brownmillerite phase to appear in the perovskite structure, which significantly changes its properties. At δ = 0.46, the content of the brownmillerite phase reaches 38%. A comparative analysis of the magnetic and transport properties of synthesized samples has been carried out. The asymptotic Curie temperature changes sign from positive at δ = 0.26 to negative at δ = 0.46. The magnetoresistance of the sample with δ = 0.46 is negative and exceeds 40% at T = 10 K. The temperature dependence of resistivity is characteristic of semiconductors, and the absolute values for samples at low temperatures differ almost tenfold.
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Investigation was supported by the Russian Foundation for Basic Research (grant no. 19-03-00017). Thermal and X-ray diffraction studies were conducted in the framework of State Task 0287-2021-0013 for the Institute of Chemistry and Chemical Technologies, Siberian Branch, Russian Academy of Sciences.
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Dudnikov, V.A., Vereshchagin, S.N., Solov’ev, L.A. et al. Structure of Metastable Sr0.8Dy0.2Co3 – δ Phases and Their Electrical and Magnetic Properties. J. Exp. Theor. Phys. 134, 290–299 (2022). https://doi.org/10.1134/S1063776122030037
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DOI: https://doi.org/10.1134/S1063776122030037