Influence of the $A$ cation on the low-temperature antiferromagnetism of ordered antiferroelectric $A_2$CoTeO$_6$ perovskites

TL;DR

This study explores how different $A$ cations influence the low-temperature antiferromagnetic properties of $A_2$CoTeO$_6$ perovskites, revealing that Te$^{6+}$ cations uniquely affect magnetic interactions.

Contribution

It provides new insights into the role of Te$^{6+}$ in modulating magnetic properties in $A_2$CoTeO$_6$ perovskites, highlighting the impact of the $A$ cation and Te$^{6+}$ on magnetic behavior.

Findings

Antiferromagnetic transition temperature decreases with smaller $A$ cation ionic size.

Te$^{6+}$ cations uniquely influence magnetic interactions compared to other $M^{6+}$ cations.

The magnetic structure is affected by the electronic influence of Te$^{6+}$.

Abstract

We have investigated the structural and magnetic properties of antiferroelectric $A_2$CoTeO$_6$ perovskites with $A$ = Cd, Ca, Sr, Pb, and Ba. All compounds are antiferromagnetic at low temperatures, with the antiferromagnetic transition temperature slightly decreasing with decreasing ionic size of the $A$ cation. Such a decrease in antiferromagnetic interaction is not observed in $A^{2+}_2$Co$M^{6+}$O$_6$ materials with other $M^{6+}$ cations of similar ionic sizes, suggesting that Te$^{6+}$ cations affect the electronic and in turn the magnetic structure of the system.