Open AccessPotassium doping effect on the lattice softening and electronic structure of Ba 1– x K x Fe 2 As 2 probed by X‐ray absorption spectroscopy
Author(s) -
Cheng J.,
Chu W. S.,
Wu G.,
Zhao H. F.,
Xu W.,
Zhou J.,
Zhang L. J.,
Chen X. H.,
Wu Z. Y.
Publication year - 2010
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049510038756
Subject(s) - doping , superconductivity , potassium , electronic structure , softening , materials science , absorption spectroscopy , crystal structure , lattice (music) , spectroscopy , crystallography , analytical chemistry (journal) , x ray absorption spectroscopy , condensed matter physics , chemistry , physics , optics , metallurgy , optoelectronics , chromatography , quantum mechanics , acoustics , composite material
Ba 1– x K x Fe 2 As 2 superconducting samples ( x = 0, 0.2, 0.4, 0.5) were synthesized by the solid‐state reaction method. In this contribution the doping effect of potassium on the lattice dynamics in this newly discovered Ba 1– x K x Fe 2 As 2 superconductor has been investigated by extended X‐ray absorption fine‐structure spectroscopy. The analysis shows that with potassium doping an increased disorder in the iron layers is mainly related to the softening of the Fe—Fe bond. Information about the electronic structure of these materials has also been obtained by looking at the X‐ray absorption near‐edge structure spectra that point out the presence of holes in the Fe‐3 d /As‐4 p hybridized orbital of the BaFe 2 As 2 ‐based system.