The dynamics of a hole in a CuO_4 plaquette: electron energy-loss spectroscopy of Li_2CuO_2

C. Waidacher; H. Eisaki; J. Fink; J. Richter; K. W. Becker; M. Knupfer; M. S. Golden; N. Motoyama; S. Atzkern; S. Uchida

arxiv: cond-mat/0007227 · v1 · submitted 2000-07-13 · ❄️ cond-mat

The dynamics of a hole in a CuO₄ plaquette: electron energy-loss spectroscopy of Li₂CuO₂

S. Atzkern , M. Knupfer , M. S. Golden , J. Fink , C. Waidacher , J. Richter , K. W. Becker , N. Motoyama

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H. Eisaki S. Uchida

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classification ❄️ cond-mat

keywords electronenergy-lossmodelplaquettesinglespectroscopywellcharge

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We have measured the energy and momentum dependent loss function of Li_2CuO_2 single crystals by means of electron energy-loss spectroscopy in transmission. Using the same values for the model parameters, the low-energy features of the spectrum as well as published Cu 2p_(3/2) x-ray photoemission data of Li_2CuO_2 are well described by a cluster model that consists of a single CuO_4 plaquette only. This demonstrates that charge excitations in Li_2CuO_2 are strongly localized.

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The dynamics of a hole in a CuO₄ plaquette: electron energy-loss spectroscopy of Li₂CuO₂

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