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Goremychkin, Guochu Deng, Huiqian Luo, Meng Wang, Pengcheng Dai, Rui Zhang, Sergey Danilkin, Xingye Lu, Zahra Yamani","submitted_at":"2013-10-09T03:31:41Z","abstract_excerpt":"We use inelastic neutron scattering (INS) spectroscopy to study the magnetic excitations spectra throughout the Brioullion zone in electron-doped iron pnictide superconductors BaFe$_{2-x}$Ni$_{x}$As$_{2}$ with $x=0.096,0.15,0.18$. While the $x=0.096$ sample is near optimal superconductivity with $T_c=20$ K and has coexisting static incommensurate magnetic order, the $x=0.15,0.18$ samples are electron-overdoped with reduced $T_c$ of 14 K and 8 K, respectively, and have no static antiferromagnetic (AF) order. 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