X-ray absorption near-edge spectra of overdoped La_2-xSr_xCuO_4 high-T_c superconductors

A. Bansil; B. Barbiellini; Fernando D. Vila; Hsin Lin; J.J. Kas; J. J. Rehr; R.S. Markiewicz; Tanmoy Das; Towfiq Ahmed

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X-ray absorption near-edge spectra of overdoped La_2-xSr_xCuO_4 high-T_c superconductors

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arxiv 1101.5451 v1 pith:I7BDRX4T submitted 2011-01-28 cond-mat.str-el

Towfiq Ahmed , Tanmoy Das , J.J. Kas , Hsin Lin , B. Barbiellini , Fernando D. Vila , R.S. Markiewicz , A. Bansil

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J. J. Rehr

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We present results for realistic modeling of the x-ray absorption near edge structure (XANES) of the overdoped high-T_c superconductor La_2-xSr_xCuO_4 in the hole doping range x = 0.20-0.30. Our computations are based on a real-space Green's function approach in which strong-correlation effects are taken into account in terms of a doping-dependent self-energy. The predicted O K-edge XANES is found to be in good accord with the corresponding experimental results in this overdoped regime. We find that the low energy spectra are dominated by the contribution of O-atoms in the cuprate planes, with little contribution from apical O-atoms.

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