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The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption |
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| Authors: | Z. Hu M. Knupfer M. Kielwein U.K. Rößler M.S. Golden J. Fink F.M.F. de Groot T. Ito K. Oka G. Kaindl |
| Affiliation: | Institute for Solid State Research, IFW Dresden, 01171 Dresden, Germany, DE Department of Inorganic Chemistry, University of Utrecht Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands, NL Correlated Electron Research Center, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan, JP Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimallee 14, 14195 Berlin, Germany, DE |
| 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. Received 7 January 2002 |
| Keywords: | PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra |
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