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We review the properties of Ni-based superconductors which contain Ni2X2(X=As, P, Bi, Si, Ge, B) planes, a common structural element found also in therecently discovered FeAs superconductors. Strong evidence for the fully gappednature of the superconducting state has come from field dependent thermalconductivity results on BaNi2As2. Coupled with the lack of magnetism, themajority of evidence suggests that the Ni-based compounds are conventionalelectron-phonon mediated superconductors. However, the increase in Tc inLaNiAsO with doping is anomalous, and mimics the behavior in LaFeAsO.Furthermore, comparisons of the properties of Ni- and Fe-based systems showmany similarities, particularly with regards to structure-propertyrelationships. This suggests a deeper connection between the physics of theFeAs superconductors and the related Ni-based systems which deserves furtherinvestigation.

Ni$_2$X$_2$ (X=pnictide, chalcogenide, or B) Based Superconductors