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. Copyright (C) EPLA, 2010
Arsenic K-edge XANES study of REFeAsO oxypnictides / W., Xu; B., Joseph; Iadecola, Antonella; A., Marcelli; W. S., Chu; D., Di Gioacchino; Bianconi, Antonio; Z. Y., Wu; Saini, Naurang Lal. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 90:5(2010), pp. 57001-57001-5. [10.1209/0295-5075/90/57001]
Arsenic K-edge XANES study of REFeAsO oxypnictides
IADECOLA, ANTONELLA;BIANCONI, Antonio;SAINI, Naurang Lal
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. Copyright (C) EPLA, 2010I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
