Electron doping in the double perovskite $LaxA2−xCrWO6$ with $A=Sr$ and Ca Available to Purchase

The ferrimagnetic double perovskites can have high Curie temperatures $TC$ above $600K$⁠. In the system $Sr2FeMoO6$ $(TC≈420K)$ electron doping by substituting, for example, $La3+$ for $Sr2+$ ions leads to a considerable increase in $TC$⁠. Here we report the same effect for $LaxCa2−xCrWO6$⁠. This demonstrates that electron doping generically increases $TC$ in the ferrimagnetic double perovskites. However, in the system $Sr2CrWO6$ $(TC≈450K)$ the preferential formation of $LaCrO3$ prevents electron doping by La substitution as supported by neutron scattering and x-ray diffraction.