Antiferromagnet-ferromagnet transitions in cobaltites

abstract

Three series of oxygen-deficient cobaltites, La0.5Ba0.5CoO3-delta, LnBaCo(2)O(5.5) and Sr2YCo4O10.5, have been studied. La0.5Ba0.5CoO3 is an insulating ferromagnet whereas La0.5Ba0.5CoO2.75 is a pure antiferromagnet in which the oxygen vacancies are disordered. The ordering of the oxygen vacancies leads to the appearance of a ferromagnetic component, apparently because of the formation of a noncollinear magnetic structure. The antiferromagnet-

keywords

MAGNETIC-STRUCTURES; PHASE-TRANSITIONS; CRYSTAL-STRUCTURE; SPIN STATES; PEROVSKITE; MAGNETORESISTANCE; TBBACO2O5.5; SEPARATION; LN

subject category

Physics

authors

Troyanchuk, IO; Bushinsky, MV; Karpinsky, DV; Sirenko, VA

Groups

acknowledgements

The authors would like to acknowledge the financial support of the BRFFI (Grant Nos. T11D-003).

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