Bandlike and excitonic states of oxygen in CuGeO3

Observation using polarized resonant soft-x-ray emission spectroscopy

L. C. Duda*, J. Downes, C. McGuinness, T. Schmitt, A. Augustsson, K. E. Smith, G. Dhalenne, A. Revcolevschi

*Corresponding author for this work

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Polarized resonant x-ray fluorescence spectroscopy at O 1s resonances was used to study CuGeO3. Two distinct spectral contributions are identified, i.e., an intense "main band" of soft-x-ray fluorescence, reflecting primarily bandlike O 2p states, and resonant inelastic x-ray scattering (RIXS) characterized by spectral features that disperse linearly with excitation energy and resonate at the O 1s pre-edge peak. RIXS reflects excitoniclike ("optical") final states and has previously only been observed for metal-ion core edges. Moreover, analysis of the excitation energy and polarization dependence of the main band allows the identification of features deriving from the site-specific partial density of states as well as strong evidence for the observation of a two-hole state (Zhang-Rice singlet).

Original languageEnglish
Pages (from-to)4186-4189
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume61
Issue number6
Publication statusPublished - 1 Feb 2000
Externally publishedYes

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