  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.
