Volume 90, Number 5, June 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 June 2010|
Arsenic K-edge XANES study of REFeAsO oxypnictides
BSRF, Institute of High Energy Physics, Chinese Academy of Sciences - 10049, Beijing, PRC
2 Dipartimento di Fisica, Università di Roma “La Sapienza" - P. le Aldo Moro 2, 00185 Roma, Italy, EU
3 INFN - Laboratori Nazionali di Frascati - Via E. Fermi 40, 00044 Frascati, Roma, Italy, EU
4 NSRL, University of Science and Technology of China - Hefei 230026, PRC
Corresponding author: email@example.com
Accepted: 27 May 2010
Arsenic K-edge X-ray absorption near-edge structure (XANES) spectroscopy has been used to investigate the local geometry around the pnictogen site in the REFeAsO (RE = La, Pr, Nd and Sm) oxypnictides, combined with full multiple-scattering calculations to understand different XANES features. The As K-edge XANES spectrum for the LaFeAsO is found to be significantly different from the other oxypnictides. The results suggest that interlayer order/disorder has a significant effect on the XANES features with the coupling between the FeAs and the REO spacers being important in the electronic and magnetic properties of the oxypnictides.
PACS: 74.70.Xa – Pnictides and chalcogenides / 78.70.Dm – X-ray absorption spectra / 71.20.-b – Electron density of states and band structure of crystalline solids
© EPLA, 2010
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