Abstract
Pure phases of a new oxyarsenide superconductor of the nominal composition CeFe 0.9Co 0.1AsO were successfully synthesized by solid state reaction in sealed silica ampoules at 1180 ∘C. It crystallizes in the layered tetragonal ZrCuSiAs type structure (sp gp P 4 / n m m ) with lattice parameter of ‘ a ’ = 3.9918 ( 5 ) Å and ‘ c ’ = 8.603 ( 1 ) Å . A sharp superconducting transition is observed at 11.31 K ( ± 0.05 K ) with an upper critical field of 45.22 T at ambient pressure. The superconducting transition temperature is drastically lowered ( ∼ 4.5 , 4.9 K) on increasing the concentration ( x = 0.15 , 0.2) of cobalt.
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