Abstract:
The review is focused on one of the most exotic families of iron-based superconductors belonging to the AFeAs structural class, where A is an alkali metal. We briefly concern physical and electronic properties of the typical members of this family, LiFeAs and NaFeAs, discuss the theoretical models describing the multigap superconducting state, and the experimental data available in literature. As well, we specify the main unsolved problems, that seem crucial for both, the AFeAs family and for iron-based superconductors in general.
This work was supported by the Ministry of Science and
Higher Education of the Russian Federation (project
no. 0023-2019-0005, topic “Physics of High-Temperature
Superconductors and Novel Quantum Materials”). The
experimental IMARE study of LiFeAs with the participation by T.E. Kuzmicheva was supported by the Russian Science Foundation (project no. 19-72-00196).
Citation:
T. E. Kuzmicheva, S. A. Kuzmichev, “Electronic and superconducting properties of the AFeAs (A = Li, Na) family alkali-metal pnictides: current stage of the research (brief review)”, Pis'ma v Zh. Èksper. Teoret. Fiz., 114:10 (2021), 685–698; JETP Letters, 114:10 (2021), 630–642