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The crystal structure and physical properties of BaFe2As2, BaCo2As2, andBaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structuraltransition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2has a structural phase transition at T0 = 131 K, followed by superconductivitybelow Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc =22 K is demonstrated by resistivity, magnetic susceptibility, and specific heatdata. In contrast to the cuprates, the Fe-based system appears to tolerateconsiderable disorder in the transition metal layers. First principlescalculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Cois weak.

BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping