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Magnetoresistance in ordered and disordered double perovskite oxide, $Sr_2FeMoO_6$

Sarma, DD and Sampathkumaran, EV and Ray, Sugata and Nagarajan, R and Majumdar, Subham and Kumar, Ashwani and Nalini, G and Row, Guru TN (2000) Magnetoresistance in ordered and disordered double perovskite oxide, $Sr_2FeMoO_6$. In: Solid State Communications, 114 (9). pp. 465-468.

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Abstract

We have prepared crystallographically ordered and disordered specimens of the double perovskite, $Sr_2FeMoO_6$, and investigated their magnetoresistance (MR) 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 MR 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.

Item Type: Journal Article
Additional Information: Copyrifght of this article belongs to Elsevier.
Keywords: A. Magnetically ordered materials;D. Electronic transport;D. Order–disorder effects;E. X-ray and gamma-ray spectroscopies
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 13 Aug 2008
Last Modified: 19 Sep 2010 04:49
URI: http://eprints.iisc.ernet.in/id/eprint/15593

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