Sintering Effects on Fe/Mo Ordering and Magnetoresistance in Double Perovskite Sr2FeMoO6
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چکیده
منابع مشابه
Magnetoresistance in ordered and disordered double perovskite oxide, Sr2FeMoO6
We have prepared crystallographically ordered and disorder specimens of the double perovskite, Sr2FeMoO6 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 respon...
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We search for general patterns that explain the low field magnetoresistance at low temperatures in the system A(2-x)A'xFeMoO6. The observed linear dependence of the low field magnetoresistance with the saturation magnetization for the series is related to the antisite disorder at the Fe and Mo sites. This is explained in terms of a spin dependent crossing of intragranular barriers originated fr...
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Metals with large positive magnetoresistance are rare. We demonstrate that antiferromagnetic metallic states, as have been predicted for the double perovskites, are excellent candidates for huge positive magnetoresistance. An applied field suppresses long range antiferromagnetic order leading to a state with short range antiferromagnetic correlations and strong electronic scattering. The field ...
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OF DOCTORAL DISSERTATION AALTO UNIVERSITY SCHOOL OF SCIENCE AND TECHNOLOGY P.O. BOX 11000, FI-00076 AALTO http://www.aalto.fi Author Eeva-Leena Rautama Name of the dissertation Cation Ordering and Oxygen Stoichiometry in Double Perovskite Systems, (Sr,La)2FeTaO6-δ and LaBaCo2O5+δ Manuscript submitted 30.4.2010 Manuscript revised N/A Date of the defence 16.7.2010 Monograph Article dissertation (...
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Pb2MReO6 (M = Co, Cr) perovskites were prepared by high pressure−high temperature method. Rietveld refinements of synchrotron powder X-ray diffraction show that the crystal structure of Pb2CoReO6 is trigonal (space group R-3) with almost complete ordering of Co and Re cations, while Pb2CrReO6 (space group Pm-3m) is a cubic perovskite with one single site for Cr and Re atoms. The difference betw...
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ژورنال
عنوان ژورنال: Journal of Magnetics
سال: 2004
ISSN: 1226-1750
DOI: 10.4283/jmag.2004.9.1.009