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