Abstract
Single crystals of Pr 2− x Ce x CuO 4 were grown using the CuO flux method. Large crystals in which the Ce distribution was homogeneous 50Ø×3 mm 3 and 10×10×0.1 mm 3, respectively. A small but high quality reduced Pr 1.84Ce 0.16CuO 4 crystals show superconductivity with a T c of 18 K and a transition width of 1.5 K. We have examined the effects of Pt contamination from the Pt crucible. Only a 1% substitution of Pt for Cu eliminates the superconductivity entirely. Pt suppresses T c more quickly in the Pr 2− x Ce x CuO 4 system than in the La 2− x Sr x CuO 4 system, where a Pt substitution of 2% eliminates the superconductivity.
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