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We report the synthesis and properties of two new insulating phases ofSrFeO3-d with introduction of oxygen deficiencies in metallic SrFeO3 ; one with0.15 < d < 0.19 (sample A)and the other above d = 0.19 (sample B). Sample Ashows large negative magnetoresistance around the charged ordering (CO)temperature with magnetic anomalies seen in the temperature dependentresistivity,magnetization and M-H hysteresis loops. Sample B shows a smoothinsulating behavior with no thermal hysteresis in the resistivity and with asmall positive magnetoresistance. cac and cdc show multiple features associatedwith a frustrated magnetic order (helical) due to competing ferro- andantiferromagnetic interactions. The competing effects of ferro- andantiferromagnetic phases extend up to T ~ 230 K revealing a new hightemperature scale in this system. These observations are discussed in thecontext of magnetic interactions associated with the varying Fe4+/Fe3+ ratio.Comment: 11 pages, 4 figure

physical review. b, condensed matter and materials physics

Magnetization and magnetoresistance in insulating phases of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Sr</mml:mi><mml:mi>Fe</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Magnetization and magnetoresistance in insulating phases ofSrFeO3−δ