Superconductivity in some heavy rare-earth iron arsenide REFeAsO 1 - δ (RE = Ho, Y, Dy and Tb) compounds

Abstract

Here, we report some new iron arsenide superconductors of REFeAsO 1-δ (RE = Ho, Y, Dy and Tb) that were successfully synthesized by a high-pressure synthesis method with a special rapid quenching process, with the onset superconducting critical temperatures at 50.3, 46.5, 52.2 and 48.5 K for RE = Ho, Y, Dy and Tb, respectively, as determined from the resistivity measurements. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.