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 Ni-3d-O-2P hybridization enhancement due to the shortening of the relevant Ni-O distance with doping. (C) 2002 Elsevier Science B.V. All rights reserved.
Fagot Revurat, Y., Malterre, D., Lannuzel, F., Janod, E., Payen, C., Gavioli, L., Bertran, F., Photoemission spectroscopy study of the hole-doped Haldane chain Y2-xSrxBaNiO5, <<NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS>>, 2003; 200 (N/A): 242-247. [doi:10.1016/S0168-583X(02)01684-1] [http://hdl.handle.net/10807/20733]
Photoemission spectroscopy study of the hole-doped Haldane chain Y2-xSrxBaNiO5
Gavioli, Luca;
2003
Abstract
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 Ni-3d-O-2P hybridization enhancement due to the shortening of the relevant Ni-O distance with doping. (C) 2002 Elsevier Science B.V. All rights reserved.
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