Using their HKZ machine, scientists from the Materials Science Division at Argonne National Lab moved on from their highly successful single crystal growth of perovskite nickelate to the investigation of unusual cobalt perovskites. In the Journal of Solid State Chemistry, N. J. Schreiber et al. describe the single crystal growth of (Pr1−yYy)1−xCaxCoO3-δ with x=0.3 and y=0.15 by applying oxygen pressures of 60 bar during the floating zone process. Measurements on the high-quality samples confirmed a first-order metal-insulator transition previously reported in polycrystalline specimens, but no evidence for assumed charge ordering was revealed.