https://doi.org/10.1051/epjap/2023220245
Regular Article
Electron energy loss spectroscopy of K0.7Fe1.7Se2 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
Electronic structure and microstructure of ternary selenide superconductor K0.7Fe1.7Se2 have been investigated by transmission electron microscopy (TEM) and energy band structure calculations. Electron energy-loss spectroscopy (EELS) was performed to study K0.7Fe1.7Se2 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.
© EDP Sciences, 2023