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

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

2009-08-24

arxiv.org/abs/0908.3372v1

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures

Scientific paper

We report significant enhancement in superconducting properties of yttrium substituted Ce1-xYxOFFeAs superconductors. The polycrystalline samples were prepared by two step solid state reaction technique. X-ray diffraction confirmed tetragonal ZrCuSiAs structure with decrease in both a and c lattice parameters on increasing yttrium substitution (with fixed F content). With smaller 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 inter and intra-granular current density. The magnetization critical current density increased by an order of magnitude at 30 K and 1 T magnetic field.

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