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Zhang","submitted_at":"2017-12-17T07:12:27Z","abstract_excerpt":"We employ polarization-resolved Raman spectroscopy to study critical nematic fluctuations in Ba(Fe$_{1-x}$Au$_x$)$_2$As$_2$ superconductors above and across well separated tetragonal to orthorhombic phase transition at temperature $T_S(x)$ and the N\\'{e}el transition at $T_N(x)$. The static Raman susceptibility in $XY$ symmetry channel increases upon cooling from room temperature following the Curie-Weiss law, with Weiss temperature $T_{\\theta}(x)$ several tens of degrees lower than $T_S(x)$. 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