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Orbital selectivity in the normal state of KFe(2)Se(2) superconductor

Craco, Luis and Leoni, Stefano ORCID: 2022. Orbital selectivity in the normal state of KFe(2)Se(2) superconductor. European Physical Society Letters 136 (2) , 27002. 10.1209/0295-5075/ac3f16

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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 KFe2Se2 superconductor. Therein, correlation- and doping-induced orbital differentiation are linked to the emergence of an incoherent-coherent crossover in the normal state of KFe2Se2 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: IOP Publishing
ISSN: 0295-5075
Date of First Compliant Deposit: 25 January 2022
Date of Acceptance: 1 December 2021
Last Modified: 01 Dec 2022 18:58

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