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Qiu","submitted_at":"2010-03-08T17:58:39Z","abstract_excerpt":"Inelastic neutron scattering from superconducting (SC) Ba(Fe$_{0.926}$Co$_{0.074}$)$_2$As$_2$ reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to \\textbf{Q}$_{\\texttt{AFM}}=({1}{2}/{1}{2})$ - the 2D antiferromagnetic (AFM) wave-vector of the parent BaFe$_2$As$_2$ compound. The correlation length anisotropy of these low energy fluctuations is consistent with spin nematic correlations in the $J_1$-$J_2$ model with $J_1/J_2 \\sim$ 1. The spin resonance at $\\sim$8.3 meV in the SC state displays the same anisotropy. 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