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

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