Superconductivity induced by doping Ru in SrFe2−xRuxAs2 |
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Authors: | Yanpeng Qi Lei Wang Zhaoshun Gao Dongliang Wang Xianping Zhang Yanwei Ma |
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Affiliation: | aKey Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, P.O. Box 2703, Beijing 100190, China |
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Abstract: | 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. |
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Keywords: | Iron-based superconductor Isoelectronic substitution |
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