X-ray absorption near-edge spectra of overdoped La₂₋ₓSrₓCuO₄ high-T(c) superconductors

Towfiq Ahmed, University of Washington
Tanmoy Das, Northeastern University
J. J. Kas, University of Washington
B. Barbiellini, Northeastern University
Fernando D. Vila, University of Washington
R. S. Markiewicz, Northeastern Univeristy
A. Bansil, Northeastern University
J. J. Rehr, University of Washington

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Originally published in Physical Review B v.83 (2011): 115117. DOI: 10.1103/PhysRevB.83.115117

Abstract

We present results for realistic modeling of the x-ray absorption near edge structure (XANES) of the overdoped high-T_c superconductor La₂₋ₓSrₓCuO₄ 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.