Review
Current stage in the study of superconducting and electron subsystem of the 1144 family stoichiometric ferropnictides
T. E. Kuzmicheva
Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky ave. 53, 119991 Moscow, Russia
e-mail: kuzmichevate@lebedev.ru
S. A. Kuzmichev
Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky ave. 53, 119991 Moscow, Russia
Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia
A. Yu. Degtyarenko
Lebedev Physical Institute of the Russian Academy of Sciences, Leninsky ave. 53, 119991 Moscow, Russia
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.
Keywords: high-temperature superconductors; pnictides; band structure; superconducting order parameter; phase diagram.
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