Regular Article

Electron energy loss spectroscopy of K_0.7Fe_1.7Se₂ superconductor

¹ School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, P.R. China
² College of Science, Dalian Jiaotong University, Dalian 116028, P.R. China

^* e-mail: zhzhang@djtu.edu.cn

Received: 19 September 2022
Received in final form: 8 December 2022
Accepted: 2 January 2023
Published online: 22 February 2023

Abstract

Electronic structure and microstructure of ternary selenide superconductor K_0.7Fe_1.7Se₂ have been investigated by transmission electron microscopy (TEM) and energy band structure calculations. Electron energy-loss spectroscopy (EELS) was performed to study K_0.7Fe_1.7Se₂ experimentally. The individual inter-bands transitions were identified through the comparison between the energy loss peak positions with the partial density of states (PDOS) obtained by first principle calculation. The electron energy-loss near-edge fine structure (ELNES) were analyzed, the core-hole effect was found to play a key role in the simulation of ELNES. The results can present some insight into the interaction between superconductivity and electronic structure in this group of iron-related superconductor.