  Delafossite oxide CuAlO2 has engaged great attention as a promising p-type
conducting oxide. In this work, high-quality CuAlO2 single crystals with a size
of several millimeters (mm) are successfully achieved with a reactive crucible
melting method. The crystals are characterized by X-ray diffraction, scanning
electron microscopy with energy-dispersive spectroscopy, transport measurement,
and magnetic susceptibility measurement. The grown single crystals are free of
contamination from a copper oxide flux. This work provides a new approach to
growing high-quality delafossite oxide CuAlO2 with a few mm size.
