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.
Lingua originale | English |
---|---|
pagine (da-a) | 242-247 |
Numero di pagine | 6 |
Rivista | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS |
Volume | 200 |
DOI | |
Stato di pubblicazione | Pubblicato - 2003 |
Keywords
- charge transfer insulator
- hole doping
- photoemission spectroscopy
- strongly correlated systems