The role of nonmagnetic d0 vs. d10 B-type cations on the magnetic exchange interactions in osmium double perovskites

TL;DR

This study investigates how different nonmagnetic B-site cations with d0 versus d10 electronic configurations influence magnetic exchange interactions in osmium double perovskites, revealing that d0 cations induce stronger magnetic interactions.

Contribution

It provides new insights into the role of B-site cation electronic configuration on magnetic interactions in osmium double perovskites.

Findings

d0 cations induce stronger magnetic exchange interactions

Structural distortions weaken magnetic interactions

Antiferromagnetic transitions observed at specific temperatures

Abstract

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.