通过在SmFeAsO中Fe位上掺入5d过渡金属Ir,得到了一种新的铁基超导体SmFe_(1-x)Ir_xAsO,当x=0.05时,样品表现出超导电性,超导转变温度为8K,当x=0. 15时,超导转变温度达到最大值17. 3K X射线衍射结果表明所有样品均属四方ZrCuSiAs-type结构,SEM结果表明SmFe_(1-x)Ir_xAsO样品具有片层状形貌特征,随着Ir掺杂量的增大,晶格参数a增大而c减小,结合EDX数据,表明Ir掺人了SmFeAsO晶格当中.
A new serious of iron-based superconductor SmFe_(1-x)Ir_xAsO has been obtained by 5d transition metal Ir partially replacing Fe in SmFeAsO. The superconductivity emerges at 8 K with the Ir doping level x = 0. 05. The superconducting transition shifts to higher temperatures with increasing Ir content, reaching a maximum value of 17. 3 K at x= 0. 15. X-ray Diffraction, SEM and EDX measurement were performed. The XRD patterns of all samples can be well indexed based on the tetragonal ZrCuSiAs-type structure, plate-like grains which present to be common features of layered compounds are observed in the SEM image. The increases of the lattice constant a and decreases of c together with the clear appearance of Ir in the EDX results indicate that iridium has been successfully substituted into the SmFeAsO compounds, forming a new serious of iron-based superconductors.
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