Abstract:
A strong anisotropic distribution of the holes in Ni 3 d and O 2 p orbitals is observed in the polarization dependent O 1 s and Ni 2 p 3/2 X-ray absorption spectroscopy of the linear-chain nickelate Y2-xCaxBaNiO5 (x = 0, 0.05, 0.1, 0.2), which demonstrates the one-dimensional nature of the electronic state in these compounds. The holes introduced by Ca-doping occupy both O 2 p and Ni 3 d orbitals along the NiO5 chains. By comparing the experimental Ni 2 p 3/2 absorption spectra of Y2-xCaxBaNiO5 to those from charge transfer multiplet calculations we can derive the orbital character of the additional holes to be of ∼60% O2 p and ∼40% Ni 3 d.
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Received 7 January 2002
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Hu, Z., Knupfer, M., Kielwein, M. et al. The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption. Eur. Phys. J. B 26, 449–453 (2002). https://doi.org/10.1140/epjb/e20020113
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DOI: https://doi.org/10.1140/epjb/e20020113