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Title: Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) Cobaltites

Abstract

The structural and elastic characteristics of YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) cobaltites synthesized by various technologies and having various excess oxygen contents x are experimentally studied. The distortion of the crystal structure in stoichiometric samples is found to remove frustrations and to bring about a longrange magnetic order in the cobalt subsystem, which is accompanied by well-pronounced anomalies in the elastic properties in the temperature range of a magnetic phase transition T{sub N}. At a weak deviation from oxygen stoichiometry, the structure distortion disappears, frustrations are retained, and the further development of a long-range magnetic order is hindered. As a result of an absent long-range magnetic order, the anomalies of the elastic characteristics at T{sub N} smooth rapidly and disappear. This finding points to the suppression of structural and magnetic transitions in nonstoichiometric samples and to the conservation of only short-range correlations of order parameter. It is found that nonstoichiometric samples can be separated into two phases depending on the ceramic synthesis conditions.

Authors:
;  [1]; ; ;  [2]
  1. Moscow State University (Russian Federation)
  2. Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, Siberian Branch (Russian Federation)
Publication Date:
OSTI Identifier:
22749857
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 5; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTAL STRUCTURE; ELASTICITY; ORDER PARAMETERS; OXYGEN; PHASE TRANSFORMATIONS; TEMPERATURE RANGE

Citation Formats

Kazei, Z. A., E-mail: kazei@plms.phys.msu.ru, Snegirev, V. V., Kozeeva, L. P., Kameneva, M. Yu., and Lavrov, A. N. Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) Cobaltites. United States: N. p., 2018. Web. doi:10.1134/S1063776118040040.
Kazei, Z. A., E-mail: kazei@plms.phys.msu.ru, Snegirev, V. V., Kozeeva, L. P., Kameneva, M. Yu., & Lavrov, A. N. Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) Cobaltites. United States. doi:10.1134/S1063776118040040.
Kazei, Z. A., E-mail: kazei@plms.phys.msu.ru, Snegirev, V. V., Kozeeva, L. P., Kameneva, M. Yu., and Lavrov, A. N. Tue . "Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) Cobaltites". United States. doi:10.1134/S1063776118040040.
@article{osti_22749857,
title = {Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) Cobaltites},
author = {Kazei, Z. A., E-mail: kazei@plms.phys.msu.ru and Snegirev, V. V. and Kozeeva, L. P. and Kameneva, M. Yu. and Lavrov, A. N.},
abstractNote = {The structural and elastic characteristics of YBaCo{sub 4}O{sub 7+ x} (x = 0, 0.1, 0.2) cobaltites synthesized by various technologies and having various excess oxygen contents x are experimentally studied. The distortion of the crystal structure in stoichiometric samples is found to remove frustrations and to bring about a longrange magnetic order in the cobalt subsystem, which is accompanied by well-pronounced anomalies in the elastic properties in the temperature range of a magnetic phase transition T{sub N}. At a weak deviation from oxygen stoichiometry, the structure distortion disappears, frustrations are retained, and the further development of a long-range magnetic order is hindered. As a result of an absent long-range magnetic order, the anomalies of the elastic characteristics at T{sub N} smooth rapidly and disappear. This finding points to the suppression of structural and magnetic transitions in nonstoichiometric samples and to the conservation of only short-range correlations of order parameter. It is found that nonstoichiometric samples can be separated into two phases depending on the ceramic synthesis conditions.},
doi = {10.1134/S1063776118040040},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 5,
volume = 126,
place = {United States},
year = {2018},
month = {5}
}