Growth of EuO single crystals at reduced temperatures

Single crystals of (Eu${}_{1-x}$Ba${}_x$)O have been grown in a molten barium-magnesium metal flux at temperatures up to 1000{\deg}C, producing single crystals of (Eu${}_{1-x}$Ba${}_x$)O with barium doping levels ranging from $x=0.03$ to $x=0.25$. Magnetic measurements show that the ferromagnetic Curie temperature T${}_C$ correlates with the Ba doping levels, and a modified Heisenberg model was used to describe the stoichiometry dependence of T${}_C$. Extrapolation of the results indicates that a sample with Ba concentration of $x=0.72$ should have a T${}_C$ of 0 K, potentially producing a quantum phase transition in this material.