RE L$_{3}$ X-ray absorption study of REO$_{1-x}$F$_{x}$FeAs (RE=La, Pr, Nd, Sm) oxypnictides

Details RE L$_{3}$ X-ray absorption study of REO$_{1-x}$F$_{x}$FeAs (RE=La, Pr, Nd, Sm) oxypnictides RE L$_{3}$ X-ray absorption study of REO$_{1-x}$F$_{x}$FeAs (RE=La, Pr, Nd, Sm) oxypnictides

2009-10-12

arxiv.org/abs/0910.2181v1

J. Phys.: Condens. Matter 21 (2009) 432201

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-8984/21/43/432201

Rare-earth L$_{3}$-edge X-ray absorption near edge structure (XANES) spectroscopy has been used to study REOFeAs (RE=La, Pr, Nd, Sm) oxypnictides. The Nd L$_{3}$ XANES due to 2p$_{3/2}\to5\epsilon$d 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 importance of local structural chemistry of the REO spacer layer and interlayer coupling in the competing superconductivity and itinerant striped magnetic phase of the oxypnictides.

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