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Ultrafast non-equilibrium quenching of superconductivity is shown to display a distinct two-step profile with strong excitation fluence and doping dependence in Ba(F1-xCox)2As2 which underpins, for the best first time, a new bosonic scattering channel from spin density wave fluctuations.
We observe a critical speeding up in the electronic relaxation time that implies that nematic fluctuations govern the electronic thermalization/cooling dynamics and that magnetic fluctuations dominate the nonlinear signals that arise from the Ising-nematicity.
We report distinct dynamics of magnetic, electronic anisotropy and charge excitations in parent and weakly Co-doped BaFe2As2, which identify the manifestation of the Ising nematic symmetry and, its contribution to magneto-structural phase transition.
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