Magnetoresistance in ordered and disordered double perovskite oxide, Sr${}_2$FeMoO${}_6$

Abstract

We have prepared crystallographically ordered and disorder specimens of the double perovskite, Sr${}_2$FeMoO${}_6$ and investigated their magnetoresistance behaviour. The extent of ordering between the Fe and Mo sites in the two samples is determined by Rietveld analysis of powder x-ray diffraction patterns and reconfirmed by Mössbauer studies. While the ordered sample exhibits the sharp low-field response, followed by moderate changes in the magnetoresistance at higher fields, the disordered sample is characterised by the absence of the spectacular low-field response. We argue that the low field response depends crucially on the half-metallic ferromagnetism, while the high-field response follows from the overall magnetic nature of the sample, even in absence of the half-metallic state.

accepted in Solid State Communication

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