{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,8,8]],"date-time":"2024-08-08T04:31:04Z","timestamp":1723091464334},"reference-count":53,"publisher":"AIP Publishing","issue":"7","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2012,7,1]]},"abstract":"<jats:p>Three series of oxygen-deficient cobaltites, La0.5Ba0.5CoO3\u2212\u03b4, LnBaCo2O5.5 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-\u201cferromagnet\u201d transition is accompanied by a giant magnetoresistance. It is suggested that in the ferromagnetic oxidized compounds, the Co3+ and Co4+ ions adopt intermediate spin states, whereas in the antiferromagnetic (Co4+-free) compositions, the Co3+ ions have a high-spin state (CoO5 pyramids) with a dominant low-spin state (CoO6 octahedra). In both the ferromagnetic and antiferromagnetic compounds, superexchange via oxygen plays an essential role in determining the magnetic properties.<\/jats:p>","DOI":"10.1063\/1.4736615","type":"journal-article","created":{"date-parts":[[2012,7,28]],"date-time":"2012-07-28T10:29:32Z","timestamp":1343471372000},"page":"662-668","update-policy":"http:\/\/dx.doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Antiferromagnet-ferromagnet transitions in cobaltites"],"prefix":"10.1063","volume":"38","author":[{"given":"I. 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