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arXiv 0904.0772cond-mat.supr-con
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掺Ir的LaFe1-xIrxAsO的超导电性

Superconductivity in Ir-doped LaFe1-xIrxAsO

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

摘要:

报道了在高温铁基超导体的原型母体化合物LaFeAsO中掺杂5d元素Ir实现超导电性。X射线衍射分析表明,材料形成了ZrCuSiAs型结构,空间群为P4/nmm。晶格常数的系统演化表明,铁离子被成功地取代的Ir。电阻和磁化强度测量表明,在LaFe 1-xIrxAsO的超导电性高达11 K。测量了不同磁场下的超导转变,在T_c附近的斜率为-dH_c ~ 2/dT = 6.7T/ K,零K时的上临界场约为55 T。这是FeAs-1111族中通过用更高d轨道电子取代Fe位而诱导的体超导性的第一个例子,这将为铁基超导体的基础物理增加更多成分。

英文摘要:

We report the realization of superconductivity by 5d element Ir doping in LaFeAsO, a prototype parent compound of high-temperature iron based superconductors. X-ray diffraction patterns indicate that the material has formed the ZrCuSiAs-type structure with a space group P4/nmm. The systematic evolution of the lattice constants demonstrated that the Fe ions were successfully replaced by the Ir. Both electrical resistance and magnetization measurements show superconductivity up to 11 K in LaFe1-xIrxAsO. The superconducting transitions at different magnetic fields were also measured yielding a slope of -dHc2/dT = 6.7 T / K near Tc, and the upper critical field at zero K is found to be about 55 T. This is the first example of bulk superconductivity induced by replacing the Fe sites with higher d-orbital electrons in FeAs-1111 family, which should add more ingredients to the underlying physics of the iron-based superconductors.

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