This article is cited in 4 papers

Magnetism

Influence of the oxygen content on the magnetic and transport properties of the La$_{0.45}$Ba$_{0.55}$CoO$_{3-x}$ cobaltites

I. O. Troyanchuk^a, A. N. Chobot^a, A. V. Nikitin^a, O. S. Mantytskaya^a, L. S. Lobanovskii^a, V. M. Dobryanskii<sup>b

a</sup> Scientific-Practical Materials Research Centre of NAS of Belarus
^b Belarusian State Agrarian Technical University, Minsk

Abstract: The properties of the La$_{0.45}$Ba$_{0.55}$CoO$_{3-x}$ cobaltites have been investigated as a function of the oxygen content. It has been shown that a decrease in the oxygen content leads to a decrease in the spontaneous magnetization, as well as to a metamagnetic behavior and a sharp increase in the magnetoresistance effect. The metamagnetism and magnetoresistance effect are caused by the phase transition from the antiferromagnetic state to the ferromagnetic state in an external magnetic field. It has been assumed that the insulating antiferromagnetic phase contains cobalt ions in a mixed high-spin/low-spin state, whereas the conducting ferromagnetic phase includes these ions in an intermediate spin state.

Received: 02.06.2015

 English version: Physics of the Solid State, 2015, 57:12, 2427–2430

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