Search for new iron oxypnictide superconductors by using high-pressure synthesis technique

Abstract

Here we report on the invention of the Co-doped induced superconductivity in PrFe 1− x Co x AsO ( x = 0 and 0.075). Polycrystalline samples were prepared by high-pressure synthesis method. The PrFe 1− x Co x AsO ( x = 0 and 0.075) crystallizes with the ZrCuSiAs type crystal structure (P4/nmm). The PrFeAsO is a parent compound with non-superconducting phase which can be transformed to superconductor by replacement 7.5% of Fe by Co. The magnetic susceptibility measurement shows the onset of superconducting transition temperature at 15 K.