Photoemission spectroscopy study of the hole-doped Haldane chain Y2−xSrxBaNiO5

In this paper, we present photoemission experiments on the hole-doped Haldane chain compound Y2-xSrxBaNiO5. By using the photon energy dependence of the photoemission cross section, we identified the symmetry of the first ionisation states (d type). Hole doping in this system leads to a significant...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2003-01, Vol.200 (Complete), p.242-247
Main Authors: Fagot-Revurat, Y., Malterre, D., Lannuzel, F.-X., Janod, E., Payen, C., Gavioli, L., Bertran, F.
Format: Article
Language:English
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Summary:In this paper, we present photoemission experiments on the hole-doped Haldane chain compound Y2-xSrxBaNiO5. By using the photon energy dependence of the photoemission cross section, we identified the symmetry of the first ionisation states (d type). Hole doping in this system leads to a significant increase in the spectral weight at the top of the valence band without any change in the vicinity of the Fermi energy. This behavior, never observed in other charge transfer oxides, could result from the Ni3d-O2p hybridization enhancement due to the shortening of the relevant Ni-O distance with doping.
ISSN:0168-583X
DOI:10.1016/S0168-583X(02)01684-1