122 iron arsenide refers to a specific class of iron-based superconductors, known for their layered structure and the presence of iron and arsenic in their composition. The "122" typically denotes the chemical formula of these compounds, which can be represented as \( AFe_2As_2 \), where \( A \) is a divalent alkaline earth metal or other element like barium (Ba) or strontium (Sr).
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