Abstract
The crystal structure and physical properties of BaFe 2As 2, BaCo 2As 2, and BaNi 2As 2 single crystals are surveyed. BaFe 2As 2 gives a magnetic and structural transition at T N = 132(1) K, BaCo 2As 2 is a paramagnetic metal, while BaNi 2As 2 has a structural phase transition at T 0 = 131 K, followed by superconductivity below T c = 0.69 K. The bulk superconductivity in Co-doped BaFe 2As 2 below T c = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe 1.84Co 0.16As 2 indicate the inter-band scattering due to Co is weak.
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