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Single crystals of the compounds LaFePO, PrFePO and NdFePO have been prepared by means of a flux growth technique and studied by electrical resistivity, magnetic susceptibility and specific heat measurements. We have found that PrFePO and NdFePO display superconductivity with values of the superconducting critical temperature T c of 3.2 and 3.1 K, respectively. The effect of annealing on the properties of LaFePO, PrFePO and NdFePO is also reported. The Ln FePO ( Ln =lanthanide) compounds are isostructural with the Ln FeAsO 1− x F x compounds that become superconducting with T c values as high as 55 K for Ln =Sm. A systematic comparison of the occurrence of superconductivity in the series Ln FePO and Ln FeAsO 1− x F x points to a possible difference in the origin of the superconductivity in these two series of compounds.
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