Enhancement of antiferromagnetic interaction and transition temperature in M3TeO6 systems (M = Mn, Co, Ni, Cu)

Several M3TeO6 (M = Mn, Co, Ni, Cu) oxides order antiferromagnetically at low temperatures (less than or similar to 60 K), while displaying interesting dielectric properties at high temperatures (ferroelectricity below 1000 K in M = Ni case). We have investigated and analyzed the structural and magnetic properties of Mn-doped Co3TeO6 and Ni3TeO6, which order antiferromagnetically at temperatures higher than their undoped counterparts.