The structures, magnetism, and electronic transport properties of (La 1+ x Sr 1 - x )CoRuO 6 (−0.50 ≤ x ≤ 0.25) double perovskites have been investigated. All samples are found to crystallize with the monoclinic P 2 1 / n superstructure. An increase of antisite disorder with | x | is found to be controlled by a reduction in the average charge and size difference between the Co and Ru states. Neutron diffraction results for (LaSr)CoRuO 6 show the presence of a long-range, ordered antiferromagnetic state with propagation vector ( 1 / 2 0 1 / 2 ) below 85 K. Hole doping ( x < 0) enhances the Neel temperature slightly, whereas electron doping ( x > 0) results in a sharp decrease. Resistivity measurements showed all compositions to be variable-range-hopping semiconductors, where hole doping decreases the resistivity by 2 orders of magnitude, but electron doping has a much less pronounced effect.
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Bos et al. (2004) studied this question.
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