Effect of Oxygen Nonstoichiometry on the Magnetic Phase Transitions in Frustrated YBaCo4O7 + x (x = 0, 0.1, 0.2) Cobaltites


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Аннотация

The structural and elastic characteristics of YBaCo4O7 + 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 TN. 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 TN 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.

Авторлар туралы

Z. Kazei

Moscow State University

Хат алмасуға жауапты Автор.
Email: kazei@plms.phys.msu.ru
Ресей, Moscow, 119992

V. Snegirev

Moscow State University

Email: kazei@plms.phys.msu.ru
Ресей, Moscow, 119992

L. Kozeeva

Nikolaev Institute of Inorganic Chemistry, Siberian Branch

Email: kazei@plms.phys.msu.ru
Ресей, Novosibirsk, 630090

M. Kameneva

Nikolaev Institute of Inorganic Chemistry, Siberian Branch

Email: kazei@plms.phys.msu.ru
Ресей, Novosibirsk, 630090

A. Lavrov

Nikolaev Institute of Inorganic Chemistry, Siberian Branch

Email: kazei@plms.phys.msu.ru
Ресей, Novosibirsk, 630090

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