The condition for a large magnetoresistance effect in perovskite cobaltites

The magnetic and magnetotransport properties of the anion-deficient perovskites La1– x Ba x CoO3–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 mag...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2013-11, Vol.39 (11), p.948-952
Main Authors: Troyanchuk, I. O., Bushinsky, M. V., Nikitin, A. V., Lobanovsky, L. S., Dobriansky, V. M., Eremenko, V. V., Sirenko, V. A.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Ferromagnetic phases
Ferromagnetism
Low temperature physics
Magnetic properties
Magnetoresistance
Magnetoresistivity
Oxygen content
Perovskites
Phase transitions
Semiconductors
Transport properties
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Summary:The magnetic and magnetotransport properties of the anion-deficient perovskites La1– x Ba x CoO3–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.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4830262