Electronic and lattice dynamical properties of the iron-based superconductors LiFeAs and NaFeAs

Abstract

The electronic structure and lattice vibrational frequencies of the newly discovered superconductors, LiFeAs and NaFeAs, are calculated within density functional theory. We show that in the vicinity of the Fermi energy, the density of states is dominated by contributions from Fe 3d states. We also calculate the electron-phonon coupling strength and show that it is too weak to account for the observed values of the superconducting transition temperatures. This seems to indicate that the iron-based superconductors are not of the conventional type.

7 pages, 5 figures,

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Cited by in corpus (5)

• Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs
• Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal
• Time of life as it is in LiFeAs
• Spin-phonon coupling and pressure effect in the superconductor LiFeAs : Lattice dynamics from first-principles calculations
• The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy