Abstract
The magnetic and magnetotransport properties of the anion-deficient perovskites La1–xBaxCoO3–δ are studied. It is shown that a gradual transition from the metallic to the semiconductor conduction and from ferromagnetism to antiferromagnetism takes place when the oxygen content decreases. The magnetoresistance is maximal at low temperatures near the concentration limit of the magnetic phase transition. A large value of the magnetoresistance is explained by the magnetic-field induced transition to a more conductive ferromagnetic phase, which occurs simultaneously with the change of a spin state of cobalt ions.
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