Metamorphoses of electronic structure of FeSe-based superconductors (Review article)

Abstract

The electronic structure of FeSe, the simplest iron based superconductor (Fe-SC), conceals a potential of dramatic increase of Tc that realizes under pressure or in a single layer film. This is also the system where nematicity, the phenomenon of a keen current interest, is most easy to study since it is not accompanied by the antiferomagnetic transition like in all other Fe-SC's. Here we overview recent experimental data on electronic structure of FeSe-based superconductors: isovalently doped crystals, intercalates, and single layer films, trying to clarify its topology and possible relation of this topology to superconductivity. We argue that the marked differences between the experimental and calculated band structures for all FeSe compounds can be described by a hoping selective renormalization model for a spin/orbital correlated state that may naturally explain both the evolution of the band structure with temperature and nematicity.

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Cited by in corpus (13)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Nematicity, magnetism and superconductivity in FeSe
• The key ingredients of the electronic structure of FeSe
• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• Resonant multigap superconductivity at room temperature near a Lifshitz topological transition in sulfur hydrides
• FeSe and the missing electron pocket problem
• Importance of dxy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• First-principles study of the electronic structure of CaKRu${}_4$P${}_4$
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$