Band structure of organic-ion-intercalated (EMIM)${}_x$FeSe superconductor

Abstract

The band structure and the Fermi surface of the recently discovered superconductor (EMIM)${}_x$FeSe are studied within the density functional theory in the generalized gradient approximation. We show that the bands near the Fermi level are formed primarily by Fe-$d$ orbitals. Although there is no direct contribution of EMIM orbitals to the near-Fermi level states, the presence of organic cations leads to a shift of the chemical potential. It results in the appearance of small electron pockets in the quasi-two-dimensional Fermi surface of (EMIM)${}_x$FeSe.

10 pages, 8 figures, published version

References in corpus (10)

• High-temperature superconductivity in iron-based materials
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Magnetism in Fe-based superconductors
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Low-energy microscopic models for iron-based superconductors: a review
• Nature of magnetic excitations in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Ionic-liquid-gating induced protonation and superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2, and Bi2Se3
• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
• Ionic gating in metallic superconductors: A brief review
• Superconductivity at 44.4 K achieved by intercalating EMIM+ into FeSe