XAFS study on Sr2FeMoxW1-xO6 double perovskite series

Bardelli, F and Meneghini, C and Mobilio, S and Sugata Ray, Sugata Ray and Sarma, DD (2006) XAFS study on Sr2FeMoxW1-xO6 double perovskite series. In: Symposium on Spintronics held at the 2005 Spring Meeting of the European-Materials-Research-Society, MAY 31-JUN 03, 2005, Strasbourg, FRANCE.

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Abstract

Sr2FeMoO6 oxide exhibit a half-metallic ferromagnetic (HMFM) ground state and has peculiar magnetic and magnetotransport properties that are very interesting both for applications and for fundamental research in the field of heavily correlated electron systems. In contrast to SrFeMoO6, Sr2FeWO6 is an insulator with an antiferromagnetic (AFM) ground state. Doping Sr2FeMoO6 with W, obtaining Sr2FeMoxW1-xO6 compounds, a composition driven metal to insulator transition (MIT) occurs at x(c) similar to 0.25. The nature of such transition is still a matter of debate and different possible scenarios have been proposed. This paper reports a detailed X-ray absorption spectroscopy (XAS) study on the Sr2FeMoxW1-xO6 series as a function of composition (0 <= x <= 1). The results demonstrate the presence of an abrupt change of the local atomic structure at x(c) that represents the structural counterpart of the electronic changes associated with the metal insulator transition.

Item Type:	Conference Paper
Publisher:	Elsavier
Additional Information:	Copyright of this article belongs to Elsavier.
Keywords:	Extended X-ray absorption fine structure (EXAFS).
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 Apr 2009 08:52
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17879

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