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

• Published in: Физика низких температур
• Date: 2016
• Main Authors: Yu.V., Pustovit, Kordyuk, A.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2016
• Subjects: К 30-летию открытия высокотемпературной сверхпроводимости
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/129320
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Metamorphoses of electronic structure of FeSe-based superconductors (Review Article) / Yu.V. Pustovit A.A. Kordyuk // Физика низких температур. — 2016. — Т. 42, № 11. — С. 1268-1283. — Бібліогр.: 107 назв. — англ.

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.