Superconductivity and Magnetism in REFeAsO1-xFx (RE=Rare Earth Elements)

Details Superconductivity and Magnetism in REFeAsO1-xFx (RE=Rare Earth Elements) Superconductivity and Magnetism in REFeAsO1-xFx (RE=Rare Earth Elements)

2008-08-04

arxiv.org/abs/0808.0289v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, Journal of Physics: Conference Series (Proceedings in the LT25 Low Temperature Physics Conference) Submitt

Scientific paper

10.1088/1742-6596/150/5/052088

Fluoride-doped iron-based oxypnictides containing rare-earth gadolinium (GdFeAsO0.8F0.2) and co-doping with yttrium (Gd0.8Y0.2FeAsO0.8F0.2) have been prepared via conventional solid state reaction at ambient pressure. The non-yttrium substituted oxypnictide show superconducting transition as high as 43.9 K from temperature dependent resistance measurements with the Meissner effect observed at a lower temperature of 40.8 K from temperature dependent magnetization measurements. By replacing a small amount of gadolinium with yttrium Tc was observed to be lowered by 10 K which might be caused by a change in the electronic or magnetic structures since the crystal structure was not altered.

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