Liscio, F and Bardelli, F and Meneghini, C and Mobilio, S and Ray, S and Sarma, DD (2006) Local structure and magneto-transport in Sr2FeMoO6 oxides. In: Symposium on Synchrotron Radiation and Materials Science held at the 2005 Spring Meeting of the European-Materials-Research-Society, May 31-JUN 03, 2005, Strasbourg, France, pp. 189-193.
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Double perovskite oxides Sr2FeMoO6 have attracted a great interest for their peculiar magneto-transport properties, and, ill particular, for the large values of low-field magneto-resistance (MR) which remains elevated even at room temperature, thanks to their high Curie temperature (T-c > 400 K). These properties are strongly influenced by chemical cation disorder, that is by the relative arrangement of Fe and Mo on their sublattices: the regular alternation of Fe and Mo enhances the M R and saturation magnetization. On the contrary the disorder generally depresses the magnetization and worsen the MR response. In this work the X-ray absorption fine structure (XAFS) technique has been employed in order to probe the cation order from a local point of view. XAFS spectra were collected at the Fe and Mo K edges on Sr2FeMoO6 samples with different degree of long-range chemical order. The XAFS results prove that a high degree of short-range cation order is preserved, despite the different long-range order: the Fe-Mo correlations are always preferred over the Fe-Fe and Mo-Mo ones in the perfectly ordered as well as in highly disordered samples.
|Item Type:||Conference Paper|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||double-perovskites; XAFS; structure.|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit|
|Date Deposited:||28 Sep 2010 10:04|
|Last Modified:||28 Sep 2010 10:04|
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