Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)

Abstract

The review is focused on one of the most exotic families of iron-based superconductors belonging to the AFeAs structural type, where A is alkali metal. We briefly concern physical and electron properties of the typical members of this family, LiFeAs and NaFeAs, discuss the theoretical models describing the multiple-gap 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.

17 pages, 6 figures, JETP Letters [in press]

References in corpus (27)

• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Spin fluctuations in LiFeAs observed by neutron scattering
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• ARPES experiment in fermiology of quasi-2D metals (Review Article)
• Microwave Surface Impedance Measurements of LiFeAs Single Crystals
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Comment on " Low-Lying Quasiparticle States and Hidden Collective Charge Instabilities in Parent Cobaltate Superconductors"
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Lower Critical Field, Anisotropy, and Two-Gap Features of LiFeAs
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe{1-x}Cox)As as revealed by scanning tunneling spectroscopy
• The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements
• The anomaly Cu doping effects on LiFeAs superconductors
• A weak-coupling superconductivity in the electron doped NaFe${}_{0.95}$Co${}_{0.05}$As is revealed by ARPES
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• Spin resonance peak in Fe-based superconductors with unequal gaps
• Orbital-selective spin waves in detwinned NaFeAs
• Structure of the pairing gap from orbital nematic fluctuations
• Phase diagram and neutron spin resonance of superconducting NaFe${}_{1-x}$Cu${}_x$As
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• Itinerant spin fluctuations in iron-based superconductors
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Cited by in corpus (1)

• Collective excitations in three-band superconductors