Magnetization and magnetoresistance in insulating phases of SrFeO3-d

Details Magnetization and magnetoresistance in insulating phases of SrFeO3-d Magnetization and magnetoresistance in insulating phases of SrFeO3-d

2005-01-14

arxiv.org/abs/cond-mat/0501352v1

Physics

Condensed Matter

Materials Science

11 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.054425

We report the synthesis and properties of two new insulating phases of SrFeO3-d with introduction of oxygen deficiencies in metallic SrFeO3 ; one with 0.15 < d < 0.19 (sample A)and the other above d = 0.19 (sample B). Sample A shows large negative magnetoresistance around the charged ordering (CO) temperature with magnetic anomalies seen in the temperature dependent resistivity,magnetization and M-H hysteresis loops. Sample B shows a smooth insulating behavior with no thermal hysteresis in the resistivity and with a small positive magnetoresistance. cac and cdc show multiple features associated with a frustrated magnetic order (helical) due to competing ferro- and antiferromagnetic interactions. The competing effects of ferro- and antiferromagnetic phases extend up to T ~ 230 K revealing a new high temperature scale in this system. These observations are discussed in the context of magnetic interactions associated with the varying Fe4+/Fe3+ ratio.

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