Anomalous spectral weight in photoemission spectra of the hole doped Haldane chain Y2-xSrxBaNiO5

In this paper, we present photoemission experiments on the hole doped Haldane chain compound \(Y_{2-x}Sr_xBaNiO_5\). 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 sig...

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Bibliographic Details
Published in:arXiv.org 2002-11
Main Authors: Fagot-Revurat, Y, Malterre, D, Lannuzel, F X, Janod, E, Payen, C, Gavioli, L, Bertran, F
Format: Article
Language:English
Subjects:
Chains
Charge transfer
Dependence
Doping
Ionization
Photoelectric emission
Spectra
Valence band
Weight
Online Access:Get full text
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Summary:In this paper, we present photoemission experiments on the hole doped Haldane chain compound \(Y_{2-x}Sr_xBaNiO_5\). 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, not observed in other charge transfer oxides at low doping level, could result from the inhomogeneous character of the doped system and from a Ni 3d-O 2p hybridization enhancement due to the shortening of the relevant Ni-O distance in the localized hole-doped regions.
ISSN:2331-8422
DOI:10.48550/arxiv.0211632