Abstract
The electrical, magnetic and magnetoresistance properties of polycrystallineSr2Fe1−xCoxMoO6 compoundswith x = 0.0, 0.05, 0.15 and 0.25 were investigated. With increasing Co content, both the degree of cationicorder and the saturation magnetic moment per formula unit of these compounds increase,while their resistivity decreases monotonically and exhibits an enhanced metallic behaviour forx≥0.15. The low-field magnetoresistance was greatly enhanced atx = 0.15, and the field dependence of magnetoresistance forx≥0.15 almost saturates above 1.5 T. These results can be well explained by the change of magnetic structureof Sr2FeMoO6 after replacing partial Fe ions by Co ions. The enhanced metallic behaviour and low-fieldmagnetoresistance also suggest a great application potential in spin electronic devices.
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