Increase of the Curie temperature of the magnetic semiconductor EuO

The possibilities are considered of greatly increasing the Curie temperature of ferromagnetic solid solutions based on europium monoxide while preserving the semiconducting character of their conductivity. The experimental results of this study attest to the existence of magnetic heterogeneity in homogeneous EuO-SmO solid solutions. The discussion is carried out within the framework of the magnetic impurity state and direct excited exchange models. It is suggested that the exchange interactions are switched in the investigated solid solutions in ''relay'' fashion.