B Joseph et al 2009 J. Phys.: Condens. Matter 21 432201 doi:10.1088/0953-8984/21/43/432201
RE L3 x-ray absorption study of REO1−xFxFeAs (RE = La, Pr, Nd, Sm) oxypnictides
FREE ARTICLEB Joseph1, A Iadecola1, M Fratini2, A Bianconi1, A Marcelli3 and N L Saini1
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Rare earth L3-edge x-ray absorption near-edge structure (XANES) spectroscopy has been used to study REOFeAs (RE = La, Pr, Nd, Sm) oxypnictides. The Nd L3 XANES due to the 
transition shows a substantial change in both white line (WL) spectral weight and the higher energy multiple scattering resonances with the partial substitution of O by F. A systematic change in the XANES features is seen due to varying lattice parameters with ionic radius of the rare earth. On the other hand, we hardly see any change across the structural phase transition. The results provide timely information on the local atomic correlations showing the importance of the local structural chemistry of the REO spacer layer and interlayer coupling in the competing superconductivity and itinerant striped magnetic phase of the oxypnictides.
- PACS
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78.70.Dm X-ray absorption spectra
74.72.-h Cuprate superconductors (high-Tc and insulating parent compounds)
- Subjects
- Dates
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Issue 43 (28 October 2009)
Received 4 August 2009, in final form 22 September 2009
Published 8 October 2009
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RE L3 x-ray absorption study of REO1−xFxFeAs (RE = La, Pr, Nd, Sm) oxypnictides
B Joseph et al 2009 J. Phys.: Condens. Matter 21 432201
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