Novel Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping

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  • 16 April 2008
Abstract
Here we report a novel class of superconductors prepared by high pressure synthesis in the quaternary layered-structure ReFeAsO1-delta (Re = Sm, Nd, Pr, Ce, La) family without F-doping. The onset superconducting critical temperature (Tc) in these compounds increases with substitution using smaller Re atoms, and the highest Tc that was obtained up to now is 55 K in SmFeAsO1-delta, which is the highest among all materials except for the multi-layered copper oxides. For the NdFeAsO1-delta system with different oxygen concentration that we studied, a dome-shaped phase diagram was found.

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