122 iron arsenide

The 122 iron arsenide unconventional superconductors are part of a new class of iron-based superconductors. They form in the tetragonal I4/mmm, ThCr₂Si₂ type, crystal structure. The shorthand name "122" comes from their stoichiometry; the 122s have the chemical formula AEFe₂Pn₂, where AE stands for alkaline earth metal (Ca, Ba Sr or Eu) and Pn is pnictide (As, P, etc.). These materials become superconducting under pressure and also upon doping. The maximum superconducting transition temperature found to date is 38 K in the Ba_0.6K_0.4Fe₂As₂. The microscopic description of superconductivity in the 122s is yet unclear.

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