We report an experimental study on the effect of Mn impurities in the optimally doped [Formula: see text] 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.
Fast recovery of the pristine magnetic and structural phases in superconducting LaFeAsO0.89F0.11 by Mn/Fe substitution / Sanna, S; Carretta, P; Moroni, M; Prando, G; Bonfà, P; Allodi, G; De Renzi, R; Martinelli, A. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 31:17(2019), p. 174002. [10.1088/1361-648X/ab0234]
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