SUPERCONDUCTIVITY IN A RU-BASED DOUBLE PEROVSKITE

The double perovskite structure Sr2YRuO6 is an antiferromagnetic insul ator with T-N similar to 26 K. Partially substituted the Ru ion by Cu the compounds increase their conductivity drastically and eventually b ecome superconducting. More intriguingly is the observation of the coe xistence of superconductivity and magnetic order. Results of the obser ved superconducting and magnetic properties can be qualitatively under stood in terms of a plausible model based on the double exchange idea.