Raising the Curie temperature in Sr 2 FeMoO 6 double perovskites by electron doping

TLDR: In this paper, the authors show that electron doping in the ferromagnetic and metallic double perovskites promotes an extraordinary rise of the Curie temperature of about 70 K above that of the pristine compound.

Abstract: Electron doping in the ferromagnetic and metallic double perovskites ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ is achieved via the partial substitution of ${\mathrm{Sr}}^{2+}$ by ${\mathrm{La}}^{3+}.$ We show that this doping promotes an extraordinary rising of the Curie temperature of about 70 K above that of the pristine compound. This finding reveals that the ferromagnetic coupling is mediated by itinerant carriers, thus providing solid experimental support to the double-exchange picture for the magnetic interactions. The observation that ${T}_{C}$ can be substantially enhanced may be of relevance for technological applications of these materials in advanced spin devices.