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

Luca Gavioli, Y. Fagot-Revurat, D. Malterre, F. X. Lannuzel, E. Janod, C. Payen, F. Bertran

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

6 Citazioni (Scopus)

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 ionization 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.
Lingua originaleEnglish
pagine (da-a)125118-125122
Numero di pagine5
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume67
DOI
Stato di pubblicazionePubblicato - 2003

Keywords

  • CHARGE DYNAMICS
  • CRYSTAL-STRUCTURE
  • ELECTRONIC-STRUCTURE
  • INVERSE-PHOTOEMISSION
  • OXIDE
  • SPIN DYNAMICS
  • Y2-XCAXBANIO5
  • Y2BANIO5

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