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Anti-site disordering in Sr2FeMoO6 double perovskites (containing Mo atoms atFe positions, and viceversa) has recently been shown to have a dramaticinfluence in their magnetic and magnetotransport properties. In the presentstudy, two polycrystalline Sr2FeMoO6 samples showing different degrees ofanti-site disorder (a nominally 'ordered' sample with 70% of cationic orderingand a nominally 'disordered' sample with 18% of cationic ordering) have beenexamined by magnetic measurements and neutron powder diffraction (NPD)techniques in the 15-500K temperature range. Our main finding is that the'disordered' sample exhibits a strong magnetic scattering (noticeable even at500K), comparable to that displayed by the 'ordered' one below TC= 415 K. Forthe 'disordered' sample, the magnetic scattering exhibited on low angle Braggpositions, is not to be ascribed to a (non-existent) ferrimagnetic ordering:our results suggest that it originates upon naturally-occurring groups of Fecations in which strong antiferromagnetic (AFM) Fe-O-Fe superexchangeinteractions are promoted, similar to those existing in the LaFeO3 perovskite.These Fe groups are not magnetically isolated, but coupled by virtue of Fe-O-MoAFM interactions, which maintain the long-range coherence of this AFMstructure. Susceptibility measurements confirm the presence of AFM interactionsbelow 770 K.Comment: 30 pages, 11 figures, to be published in PR

physical review. b, condensed matter

Origin of neutron magnetic scattering in antisite-disordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">FeMoO</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>double perovskites

Origin of neutron magnetic scattering in antisite-disorderedSr2FeMoO6double perovskites