Abstract
Abstracts This work investigates in the insulating double perovskites Sr 2− x Ca x YRuO 6 . We address the angular dependence of the strength of the magnetic coupling due to the deviation from planarity of the basal layers of the monoclinic structure, characterized by the in-plane angle α α =144° for x =1) while the bond distances vary in a complex way as a consequence of the strong monoclinic distortion. We found that the magnetic transition temperature, T M , shows a linear dependence on cos [( π − α )/2]. This result is discussed in terms of t 2 g ( π )– e g ( σ ) mixing of the magnetic orbitals of the Ru 5+ ions and unbalanced competitive super-exchange interactions. The deleterious effect of Ca doping for the magnetic coupling is confirmed by the reduction in the short-range antiferromagnetic correlations characteristic of the parent compound at T >> T M and the enhancement of magnetic frustration for T T M .
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