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Double perovskite oxides Sr2FeMoO6 have attracted a great interest for their peculiar magneto-transport properties, and, in particular, for the large values of low-field magneto-resistance (MR) which remains elevated even at room temperature, thanks to their high Curie temperature (Tc > 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 MR 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 …
Publication date: 
1 May 2006

F Liscio, F Bardelli, C Meneghini, S Mobilio, Sugata Ray, DD Sarma

Biblio References: 
Volume: 246 Issue: 1 Pages: 189-193
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms