title: Observation of the weak electronic correlations in KFeCoAs2(3d6): an isoelectronic to the parent compounds of 122 series of iron pnictides BaFe2As2.
abstract: Using the angle-resolved photoemission spectroscopy and band structure calculations we study the electronic structure of KFeCoAs2, which is isoelectronic to the parent material of 122 series of iron-based superconductors BaFe2As2. Although band structure calculations predict nearly identical dispersions of the electronic states in both compounds, experiment reveals drastic differences in both the global renormalization and Fermi surfaces. On the basis of the comparison of electronic structures of these two isoelectronic compounds, we demonstrate local magnetic correlations as a vital role for the peculiar low-energy electron dynamics of iron-based superconductors.
authors.affiliation: Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany. State Key Laboratory of Functional Materials for Informatic, SIMIT, Chinese Academy of Sciences, Shanghai 200050, People's Repubic of China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Liu
authors.forename: A N
authors.initials: AN
authors.lastname: Yaresko
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: P C
authors.initials: PC
authors.lastname: Dai
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: C T
authors.initials: CT
authors.lastname: Lin
authors.forename: S V
authors.initials: SV
authors.lastname: Borisenko