Abstract
Due to multiple-band structure, an interplay between superconducting and magnetic subsystems, the members of the 1144 iron-pnictide family show a number of unique properties not typical to other ferropnictide families. Nonetheless, a quick degradation in open air causes a lack of experimental probes of such extraordinary compounds. In the review, we briefly consider the crystal structure, doping and pressure phase diagram, band-structure features, as well as summarize the available experimental data on the gap structure of the 1144 family pnictides. We compare the properties of the 1144 materials with those of a sister 122 family compounds.
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