Using one-step solid state reaction method, we have successfully synthesized the superconductor SrFe1-xRuxAs. X-ray diffraction indicates that the material has formed the ThCr2Si2-type structure with a space group I4/mmm. The systematic evolution of the lattice constants demonstrates that the Fe ions are successfully replaced by the Ru. By increasing the doping content of Ru, the spin-density-wave (SDW) transition in the parent compound is suppressed and superconductivity emerges. The maximum superconducting transition temperature is found at 13.5 K with the doping level of x = 0.7. The temperature dependence of DC magnetization confirms superconducting transitions at around 12 K. Our results indicate that similar to non-isoelectronic substitution, isoelectronic substitution contributes to changes in both the carrier concentration and internal pressure, and superconductivity could be induced by isoelectronic substitution.
@article{arxiv.0903.4967,
title = {Superconductivity induced by doping Ru in SrFe2-xRuxAs2},
author = {Yanpeng Qi and Lei Wang and Zhaoshun Gao and Dongliang Wang and Xianping Zhang and Yanwei Ma},
journal= {arXiv preprint arXiv:0903.4967},
year = {2015}
}