Dynamics of a hole in a CuO4 plaquette: Electron energy-loss spectroscopy of Li2CuO2

Authors
Atzkern, S Knupfer, M Golden, MS Fink, J Waidacher, C Richter, J Becker, KW Motoyama, N Eisaki, H Uchida, S
Citation
S. Atzkern et al., Dynamics of a hole in a CuO4 plaquette: Electron energy-loss spectroscopy of Li2CuO2, PHYS REV B, 62(12), 2000, pp. 7845-7849
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
12
Year of publication
2000
Pages
7845 - 7849
Database
ISI
SICI code
0163-1829(20000915)62:12<7845:DOAHIA>2.0.ZU;2-3
Abstract
We have measured the energy- and momentum-dependent loss function of Li2CuO 2 single crystals by means of electron energy-loss spectroscopy in transmis sion. Using the same values for the model parameters, the low-energy featur es of the spectrum as well as published Cu 2p(3/2) x-ray photoemission data of Li2CuO2 are well described by a cluster model that consists of a single CuO4 plaquette only. This demonstrates that charge excitations in Li2CuO2 are strongly localized.