标题： 超导 LaFeAsO$_{0.89}$F$_{0.11}$中原始磁性和结构相的快速恢复通过 Mn/Fe 替换 显示英文标题

标题： Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO$_{0.89}$F$_{0.11}$ by Mn/Fe substitution

摘要： 我们报告了关于掺杂Mn杂质在最佳掺杂的LaFeAsO$_{0.89}$F$_{0.11}$化合物中的实验研究。 结果表明，极少量的Mn，约为0.1%，足以破坏超导性，并在低温下恢复原始LaFeAsO母化合物的磁基态和正交结构。 这些结果在一个模型中进行了讨论，该模型中电子关联增强了杂质之间的Ruderman-Kittel-Kasuya-Yosida相互作用。 显示英文摘要

摘要： We report on an experimental study of the effect of Mn impurities in the optimally doped LaFeAsO$_{0.89}$F$_{0.11}$ compound. The results show that a very tiny amount of Mn, of the order of 0.1\%, is enough to destroy superconductivity and to recover at low temperatures both the magnetic ground state and the orthorhombic structure of the pristine LaFeAsO parent compound. The results are discussed within a model where electron correlations enhance the Ruderman-Kittel-Kasuya-Yosida interaction among impurities.