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arXiv 0903.4967cond-mat.supr-con
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SrFe2-xRuxAs2中Ru掺杂诱导的超导电性

Superconductivity induced by doping Ru in SrFe2-xRuxAs2

Yanpeng Qi, Lei Wang, Zhaoshun Gao, Dongliang Wang, Xianping Zhang, Yanwei Ma

摘要:

采用一步固相反应法成功地合成了SrFe_(1-x)RuxAs超导体。X射线衍射分析表明,材料形成了ThCr 2Si 2型结构,空间群为I4/mmm。晶格常数的系统演化表明,铁离子被成功地取代的Ru。随着Ru掺杂量的增加,母体化合物中的自旋密度波(SDW)跃迁被抑制,出现了超导电性。当x = 0.7时,超导转变温度最高为13.5K。直流磁化强度的温度依赖性证实了在12 K附近的超导转变。我们的研究结果表明,类似于非等电子取代,等电子取代有助于改变的载流子浓度和内部压力,超导电性可以诱导等电子取代。

英文摘要:

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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