Abstract

CeOFeAs is a versatile oxy‐arsenide which shows a variety of electrical and magnetic properties. Superconductivity in this system has been achieved by doping electrons through different ionic substitutions by sealed tube reactions at ∼1100 °C. The superconducting transition temperature (Tc) and upper critical field (Hc2) could be optimized by substitution of suitable ions at Ce, O and Fe site. The highest Tc obtained was ∼49 K in a Y‐doped CeO0.9F0.1FeAs.

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