Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 17, Issue -, Pages 730-736Publisher
WILEY-BLACKWELL
DOI: 10.1107/S0909049510038756
Keywords
EXAFS; XANES; Ba1-x K (x) Fe2As2
Categories
Funding
- National Outstanding Youth Fund [10125523]
- Chinese Academy of Sciences [KJCX2-YW-N42]
- National Natural Science Foundation of China [10805055]
- Institute of High Energy Physics (IHEP) [542009IHEPZZBS50845]
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Ba1-x K (x) Fe2As2 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 Ba1-x K (x) Fe2As2 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-3d/As-4p hybridized orbital of the BaFe2As2-based system.
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