The role of nonmagnetic d0 vs. d10B-type cations on the magnetic exchange interactions in osmium double perovskites

• Magnetic properties of double perovskites Ba2BOsO6 (B=Sc, Y, In) were studied.
• A d0B-type cation induces stronger magnetic interactions than a d10.
• Structural distortions weaken the overall Os5+-Os5+ magnetic interactions.

Polycrystalline samples of double perovskites Ba2BOsO6 (B=Sc, Y, In) were synthesized by solid state reactions. They adopt the cubic double perovskite structures (space group, Fm-3m) with ordered B and Os arrangements. Ba2BOsO6 (B=Sc, Y, In) show antiferromagnetic transitions at 93 K, 69 K, and 28 K, respectively. The Weiss-temperatures are −590 K for Ba2ScOsO6, −571 K for Ba2YOsO6, and −155 K for Ba2InOsO6. Sc3+ and Y3+ have the open-shell d0 electronic configuration, while In3+ has the closed-shell d10. This indicates that a d0 B-type cation induces stronger overall magnetic exchange interactions in comparison to a d10. Comparison of Ba2BOsO6 (B=Sc, Y, In) to their Sr and Ca analogues shows that the structural distortions weaken the overall magnetic exchange interactions.

Magnetic properties of osmium double perovskites Ba2BOsO6 (B=Sc, Y, In) were studied. Comparison of Ba2BOsO6indicates that a d0 B-type cation induces stronger overall magnetic exchange interactions in comparison to a d10.Figure optionsDownload as PowerPoint slide