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- Title
Electronic structure, topological phase transitions and superconductivity in (K, Cs)FeSe.
- Authors
Nekrasov, I.; Sadovskii, M.
- Abstract
We present LDA band structure of novel hole doped high temperature superconductors ( T ∼ 30 K) KFeSe and CsFeSe and compare it with previously studied electronic structure of isostructural FeAs superconductor BaFeAs (Ba122). We show that stoichiometric KFeSe and CsFeSe have rather different Fermi surfaces as compared with Ba122. However at about 60% of hole doping Fermi surfaces of novel materials closely resemble those of Ba122. In between these dopings we observe a number of topological Fermi surface transitions near the Γ point in the Brillouin zone. Superconducting transition temperature T of new systems is apparently governed by the value of the total density of states (DOS) at the Fermi level.
- Subjects
ELECTRONIC structure; PHASE transitions; HIGH temperature superconductors; SUPERCONDUCTIVITY; IRON compounds; DOPED semiconductors; STOICHIOMETRY
- Publication
JETP Letters, 2011, Vol 93, Issue 3, p166
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S002136401103012X