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- Title
Structure of Metastable Sr<sub>0.8</sub>Dy<sub>0.2</sub>Co<sub>3 – δ</sub> Phases and Their Electrical and Magnetic Properties.
- Authors
Dudnikov, V. A.; Vereshchagin, S. N.; Solov'ev, L. A.; Gavrilkin, S. Yu.; Tsvetkov, A. Yu.; Sitnikov, M. V.; Orlov, Yu. S.
- 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.
- Subjects
MAGNETIC properties; COBALT; COBALT oxides; CURIE temperature; ABSOLUTE value; LOW temperatures
- Publication
Journal of Experimental & Theoretical Physics, 2022, Vol 134, Issue 3, p290
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776122030037