Two new tellurite compounds ACu3Te2O8 (A = Ca, Cd) with ferromagnetic spin-1/2 kagomé layers

Abstract

Two new tellurite compounds ACu₃Te₂O₈ (A = Ca, Cd) have been synthesized by a typical hydrothermal method, exhibiting a similar 2D layered structure in the trigonal system of space group Rm, where Cu²⁺ ions construct a spin-1/2 regular kagomé lattice via corner-sharing. Magnetic measurements confirmed that ACu₃Te₂O₈ (A = Ca, Cd) possesses antiferromagnetic ordering at low temperature, while exchange interactions between magnetic ions within layers are ferromagnetic.