Orbital selectivity in the normal state of KFe2Se2 superconductor. (1st February 2022)

• Record Type: Journal Article
• Authors: Craco, L.; Leoni, S.
• Is Part Of: Europhysics letters. Volume 136:Number 2(2021)
• Publication Date: 2022-02-01
• Subjects: Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/ac3f16
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: Using density functional dynamical mean-field theory, we show how correlation effects lead to pseudogap and Kondo-quasiparticle features in the electronic structure of pure and doped KFe2 Se2 superconductor. Therein, correlation- and doping-induced orbital differentiation are linked to the emergence of an incoherent-coherent crossover in the normal state of KFe2 Se2 superconductor. This crossover explains the puzzling temperature- and doping-dependent evolution of resistivity and Hall coefficient, seen in experiments of alkali-metal intercalated iron-selenide superconductors. Our microscopic description emphasises the role of incoherent and coherent electronic excitations towards unconventional transport responses of strange, bad metals.