Behavior of Cobalt and Rare-Earth Subsystems in Frustrated Cobaltites DyBaCo4O7 + x

Structural, elastic, and magnetic properties of cobaltites DyBaCo 4 O 7 +   x produced by various technologies and distinguished by oxygen excess x are experimentally studied. It was found that rhombic distortion of the crystal structure of annealed stoichiometric samples with x = 0 results in frust...

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Bibliographic Details
Published in:Physics of the solid state 2018-12, Vol.60 (12), p.2507-2516
Main Authors: Kazei, Z. A., Snegirev, V. V., Stolyarenko, M. S., Pigalskii, K. S., Kozeeva, L. P., Kameneva, M. Yu, Lavrov, A. N.
Format: Article
Language:English
Subjects:
Anomalies
Antiferromagnetism
Cobalt
Couplings
Crystal structure
Elastic properties
Magnetic permeability
Magnetic properties
Magnetism
Physics
Physics and Astronomy
Rare earth elements
Solid State Physics
Subsystems
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Summary:Structural, elastic, and magnetic properties of cobaltites DyBaCo 4 O 7 +   x produced by various technologies and distinguished by oxygen excess x are experimentally studied. It was found that rhombic distortion of the crystal structure of annealed stoichiometric samples with x = 0 results in frustration removal and elastic property anomalies in the T N region, caused by cobalt subsystem ordering. At an insignificant oxygen nonstoichiometry, no structural distortions occur in quenched samples, and anomalies in elastic characteristics in the T N region smooth and disappear. The studies of DyBaCo 4 O 7 +   x magnetic properties show that the rare-earth (RE) subsystem remains paramagnetic and its contribution exceeds the contribution of the Co-subsystem with strong antiferromagnetic couplings by an order of magnitude. The magnetic susceptibility of the stoichiometric sample does not exhibit an appreciable anomaly at T N , since cobalt subsystem ordering is not accompanied by the formation of a noticeable effective field on RE ions.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419010128