Magnetization and magnetoresistance in insulating phases of SrFeO3

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.72.054425
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume72
Issue5
AbstractTwo insulating phases of SrFeO3−have been found by the introduction of oxygen deficiencies in metallic SrFeO3,one with0.15 0.19 Sample A and the other above=0.19 Sample B.Sample A shows large negative magnetoresistance around the charge ordering temperature CO associated with a magnetic anomaly. A three-dimensional variable range hopping associated with a localized moment antiferromagnetic behavior was seen in Sample B without any measurable CO down to 70 K. Ac and dc susceptibilities ac and dc show multiple magnetic anomalies associated with a frustrated magnetic order with competing ferro- and antiferromagnetic interactions. The frustration decreases with increasing content of Fe3+, the direct consequence of which is the dilution of helical magnetic spin ordering. The competing effects of ferro- and antiferromagnetic phases extend up to high temperatures T 230 K revealing a characteristic temperature scale not known earlier. These observations are discussed in the context of magnetic interactions associated with Fe4+/Fe3+.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52168
NPARC number16187137
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Record identifiera93e7dd5-dce1-4dd0-b536-d100fb3e0a19
Record created2010-10-07
Record modified2016-05-09
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