Journal
PHYSICAL REVIEW B
Volume 62, Issue 16, Pages 10752-10765Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.10752
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We have carried out experimental and theoretical studies of the unoccupied electronic structure of Sr2CuO3, which can be regarded as the best realization of a one-dimensional model system containing cuprate chains. In the polarization-dependent x-ray absorption spectra, the contributions to the upper Hubbard band from states originating from the two inequivalent oxygen sites are energetically well separated. Theoretical analysis of the measured hole distribution within cluster calculations reveals a markedly enhanced effective nearest-neighbor intersite Coulomb interaction, V(pd)similar to2 to 3 eV, or sizable contributions from next-nearest-neighbor interactions, provided a finite on-site energy difference of the two inequivalent oxygen sites Delta (pp) is taken into account. Including next-nearest-neighbor interactions, reasonable agreement can be achieved with recent electron energy-loss spectroscopy data from the same compound. The 2p oxygen orbital analysis of the unoccupied electronic structure of the single-chain cuprate Sr2CuO3 reveals strong similarities with that of the double chain compound SrCuO2.
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