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We report significant enhancement in superconducting properties of yttriumsubstituted Ce1-xYxOFFeAs superconductors. The polycrystalline samples wereprepared by two step solid state reaction technique. X-ray diffractionconfirmed tetragonal ZrCuSiAs structure with decrease in both a and c latticeparameters on increasing yttrium substitution (with fixed F content). Withsmaller ion Y in place of Ce, the transition temperature increased by 6 K.Yttrium doping also lead to higher critical fields as well as stronger interand intra-granular current density. The magnetization critical current densityincreased by an order of magnitude at 30 K and 1 T magnetic field.

Enhancement in transition temperature and critical current density of CeO0.8F0.2FeAs by yttrium doping