Abstract
The ferromagnetic system Sr2FeMoO6 is considered fundamental to understand the half-metallicity and the Curie temperature in double perovskites, experimental results in this compound have shown that the addition of itinerant electrons increases the Curie temperature with important effects in its physical properties. In this work, we present the structural and electronic properties of the double perovskite Sr2-yLayFeMoO6 (y=0.25, 0.5, 0.75 and 1.0) compound including disorder (12.5% and 25%) effects. It is well known experimentally that the effect of substituting divalent ions (Sr2+) by trivalent ions (La3+) in Sr2FeMoO6 is to increase the electronic density at Mo (4d) orbitals and therefore induce disorder at Fe and Mo sites, this kind of disorder is considered in this work. Our results show that the highest disorder considered in this study (25%) destroys the half-metallicity of the perovskite compound for all La compositions.
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