Observation of the weak electronic correlations in KFeCoAs2 (3d 6): an isoelectronic to the parent compounds of 122 series of iron pnictides BaFe2As2

Z H Liu; A N Yaresko; Y Li; P C Dai; H Zhang; B Büchner; C T Lin; S V Borisenko

doi:10.1088/1361-648X/aa5486

Observation of the weak electronic correlations in KFeCoAs₂ (3d ⁶): an isoelectronic to the parent compounds of 122 series of iron pnictides BaFe₂As₂

J Phys Condens Matter. 2017 Mar 1;29(8):085503. doi: 10.1088/1361-648X/aa5486. Epub 2016 Dec 19.

Authors

Z H Liu¹, A N Yaresko, Y Li, P C Dai, H Zhang, B Büchner, C T Lin, S V Borisenko

Affiliation

¹ 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.

PMID: 27991428
DOI: 10.1088/1361-648X/aa5486

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.