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Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals

We investigate properties of BaFe2As2 (122) single crystals upon gold doping, which is the transition metal with the highest atomic weight. The Au substitution into the FeAs-planes of 122 crystal structure (Au-122) is only possible up to a small amount of ~3%. We find that 5d is more effective in reducing magnetism in 122 than its counter 3d Cu, and this relates to superconductivity. We provide evidence of short-range magnetic fluctuations and local-lattice inhomogeneities that may prevent strong percolative superconductivity in Ba(Fe1-xAux)2As2.

preprint2015arXivOpen access
Li LiHuibo B. CaoMichael A. McGuireJungsoo S. KimGreg R. StewartAthena S. Sefat
cond-mat.supr-con
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Li LiHuibo B. CaoMichael A. McGuireJungsoo S. KimGreg R. StewartAthena S. Sefat

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