Arsenic K-edge XANES study of REFeAsO oxypnictides

W. Xu; B. Joseph; A. Iadecola; A. Marcelli; W. S. Chu; D. Di Gioacchino; A. Bianconi; Z. Y. Wu; N. L. Saini

doi:10.1209/0295-5075/90/57001

All issues

Volume 90 / No 5 (June 2010)

EPL, 90 5 (2010) 57001

Abstract

Issue		EPL Volume 90, Number 5, June 2010


Article Number		57001
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/90/57001
Published online		29 June 2010

EPL, 90 (2010) 57001

Arsenic K-edge XANES study of REFeAsO oxypnictides

W. Xu¹, B. Joseph², A. Iadecola², A. Marcelli³, W. S. Chu¹, D. Di Gioacchino³, A. Bianconi², Z. Y. Wu⁴^,1 and N. L. Saini²

¹ 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: naurang.saini@roma1.infn.it

Received: 8 March 2010
Accepted: 27 May 2010

Abstract

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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